Xiaomi Smart Doorbell 4 | Infrared Night Vision, 3MP HD, 160° Wide Angle, Cat Eye Camera, Work for Mi Home
৳7,390.00 Original price was: ৳7,390.00.৳6,775.00Current price is: ৳6,775.00.
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You can buy the Xiaomi Smart Doorbell 4 MJML04BY at the best price in Bangladesh from Extreme Gadgets
Xiaomi Smart Doorbell 4 MJML04BY
The Xiaomi Smart Doorbell 4 MJML04BY is a next-generation smart home security device that combines high-definition video, wide-angle monitoring, and intelligent connectivity with the Mi Home app. With powerful features like infrared night vision, cloud storage, and a long-lasting rechargeable battery, it enhances both convenience and home safety.
Key Features
- 3MP HD Video Quality: Delivers crystal-clear images with rich detail for better security monitoring.
- 160° Ultra-Wide Angle Lens: Expands the field of view to reduce blind spots at the front door.
- Infrared Night Vision: Ensures clear visibility and monitoring even in low-light or nighttime conditions.
- Wireless & Smart Integration: Works seamlessly with the Mi Home APP (CN region) for real-time monitoring, notifications, and video playback.
- Long-Lasting Battery: Built-in 5100mAh rechargeable battery for extended use without frequent charging.
- Cloud Storage Support: Securely saves recordings in the cloud for safe and easy access.
Important Notes
- When installing with adhesive backing, allow 24 hours for the adhesive to achieve optimal strength. Recommended installation height is 1.5 meters. Avoid installing on metallic surfaces where possible.
- Requires connection to a 2.4GHz Wi-Fi network. Not compatible with 5GHz networks and cannot operate without internet connectivity.
- The Xiaomi Smart Doorbell 4 is the Chinese version. Users must switch the Mi Home App region to Chinese Mainland for compatibility. Not supported with the Global Version of Mi Home.
Technical Specifications – Doorbell (MJML04BY)
- Product Name: Xiaomi Smart Doorbell 4
- Model: MJML04BY
- Region: China
- Rated Input: 5V = 2A
- Wireless Connections:
- Wi-Fi IEEE 802.11 b/g/n/ax (2.4GHz)
- Low-power Bluetooth
- 433MHz connection
- Battery Capacity: 5100mAh
- Storage Method: Cloud storage
- Working Temperature: -10°C to 45°C
- Charging Temperature: 0°C to 45°C
- Supported Systems: Android™ 8.0 and iOS 12.0 or later
- Execution Standard: GB 4943.1-2022
Technical Specifications – Smart Doorbell Receiver (MJJSQ01BY)
- Product Name: Smart Doorbell Receiver
- Model: MJJSQ01BY
- Region: China
- Rated Input: 100-240V~ 50-60Hz 0.04A
- Wireless Connection: 433MHz
- Operating Temperature: -10°C to 45°C
- Operating Humidity: 10% – 90% RH (non-condensing)
Why Choose the Xiaomi Smart Doorbell 4 MJML04BY?
- Wide 160° coverage and HD clarity for peace of mind
- Infrared night vision for 24/7 protection
- Easy integration with Mi Home APP (CN)
- Long-lasting rechargeable battery with efficient power usage
- Cloud storage for secure video recording
- Compact receiver for instant chime alerts indoors
The Xiaomi Smart Doorbell 4 MJML04BY is a reliable, feature-rich smart doorbell solution for modern homes—offering clear visuals, smart connectivity, and round-the-clock monitoring.
Whats’s the price of Xiaomi Smart Doorbell 4 MJML04BY in Bangladesh?
The price of Xiaomi Smart Doorbell 4 MJML04BY in Bangladesh is 6775 BDT

We will call you to confirm your order (between 11 AM – 7 PM). Kindly answer the call. If we are unable to reach you, please send us a message through our official Facebook page inbox.
Delivery Time
Inside Dhaka Home Delivery: 24-48 hours
Outside Dhaka Delivery: 24-72 hours
Delivery time depends on the courier service—usually 1–2 days inside or outside Dhaka. We use Sundarban, Pathao, eCourier, etc. Delays may occur due to courier issues.
Order processing and delivery time may be delayed due to stock issues, promotional offers, sale periods or other management issues.
Order Confirmation Payment Required
An advance payment of 100–200 BDT or more is required for order confirmation, depending on the product type and order amount.
Delivery Charge Details
Inside Dhaka: 60 Tk Only
Outside Dhaka: 120 Tk – If the product price exceeds 2000 BDT, an additional 10 BDT or 1% COD charge will be added for every 1000 BDT (as per courier policy).
Example: For a 3000 BDT product price, the delivery charge becomes 120+10=130 BDT, making the total 3130 BDT.
If you choose full prepayment, the 1% COD charge will be waived. Accepted payment methods: Bank Transfer, bKash, other Mobile Financial Services (MFS), Credit Card or EMI
Full Pre-payment / Partial Payment might required Outside Dhaka Courier, We’ll call you for further process & pre- payment details.
Full pre payment required for some specific or offer product, we’ll call you for details.
Note: For areas outside Dhaka City metro, including places like Savar, Tongi, Keraniganj, Demra, and similar locations, a 1% COD charge is applicable due to the courier company’s policy.Delivery charges may be higher than usual depending on the product’s size, weight, and quantity (e.g., fans, air purifiers, Home appliances & large items: Delivery starts at 100৳ in Dhaka, 150৳ outside.).
Fragile items may incur additional handling charges. We ensure all products are packed securely and delivered in excellent condition.
Important Usage Instructions
Always charge your device using a 5W/10W max or 5V:1A power adapter (recommended).
Warranty & Authenticity
We provide official dealer/distributor warranties only.
You can verify product authenticity by checking the distributor’s /dealers warranty sticker. This reflects our commitment to transparency and honesty.
Disclaimer:
1. For certain specific products, full prepayment is compulsory. Details will be provided during confirmation.
2. Backorder means the item is currently out of stock, but you can still place an order. It will be delivered once it becomes available again.
We reserve the right to cancel any order at any time, even after confirmation or advance payment. This is because issues can occasionally arise from the supply chain, delivery hubs, or dealer points. In such cases, you will, of course, receive a refund. Learn more from our Return & Refund Policy.
3. Charges are subject to change at any time or during promotional periods. If not updated on the website, we will inform you directly by phone.
4. Before placing an order, please verify the product’s color, stock, and current price via our Facebook Messenger. For every order, we will also call and reconfirm the details. Prices and stock are subject to change at any time due to updates from the dealer or distributor, and actual stock/price may change if central stock runs out. Since there are thousands of products on our website, it’s not always possible to update stock status or prices immediately, and occasional errors may occur.
5. Before making full payment, please confirm the product’s actual stock by contacting us via text or call.
6. After receiving the parcel from delivery man, Before opening the box of the product, must make an unboxing video from the complete packaging condition for any type of service & warranty. Customers must send a clear video & photo of the damaged, defective, or wrong product along with the shipping packaging for accurate verification under good lighting conditions.
Read more from Return & refund policy.
7. For a few days, the product must remain in its original condition—complete, fresh, and without any scratches—to qualify for a replacement, warranty, or refund. This ensures we can resolve any issues promptly and fairly. Thank you for your cooperation.
8. If you find any manufacturing problem issue after receiving, we’ll replace it instantly, must inform us within 24 hours after receiving the product for warranty service
Do not make any scratches; the product must be 100% fresh.
► Keep the small sticker on the device and product box intact. If the sticker is removed or scratched, you will not receive any service. You may remove the sticker later if you wish, but for long-term warranty purposes, please keep the box, all accessories, and stickers as they are.
Please read our complete Warranty Policy and Terms & Conditions before making a purchase.
For any assistance, please contact us through our official Facebook page inbox.
9. We sell only 100% authentic products sourced from verified importers.
Smart tools, smart gadgets, home appliances, smart gadgets are CN Region items. These are imported from China. Most of our items are also sold internationally.Please review product details and customer feedback before purchasing on your own.
10. No returns or refunds for personal preferences. Once opened, products are non-returnable unless there’s a manufacturing defect. In that case, a replacement is offered within 24 hours. We sell based on demand and do not provide servicing.
Note: Product information may change; actual packaging may differ. Always read the manual, labels, warnings, and directions before use. For details, contact the manufacturer. Any medical-related gadget is not a substitute for professional medical equipment. Do not use for self-diagnosis or treatment. Contact your healthcare provider if you have a medical issue. Extreme Gadgets is not liable for product inaccuracies or any health issues. We are not liable for any malfunction of the gadget or any harm caused to health.
Thank you for choosing Extreme Gadgets.
Your satisfaction is our priority.
Stay connected, stay extreme!
Only logged in customers who have purchased this product may leave a review.
You can buy the Xiaomi Smart Doorbell 4 MJML04BY at the best price in Bangladesh from Extreme Gadgets
Xiaomi Smart Doorbell 4 MJML04BY
The Xiaomi Smart Doorbell 4 MJML04BY is a next-generation smart home security device that combines high-definition video, wide-angle monitoring, and intelligent connectivity with the Mi Home app. With powerful features like infrared night vision, cloud storage, and a long-lasting rechargeable battery, it enhances both convenience and home safety.
Key Features
- 3MP HD Video Quality: Delivers crystal-clear images with rich detail for better security monitoring.
- 160° Ultra-Wide Angle Lens: Expands the field of view to reduce blind spots at the front door.
- Infrared Night Vision: Ensures clear visibility and monitoring even in low-light or nighttime conditions.
- Wireless & Smart Integration: Works seamlessly with the Mi Home APP (CN region) for real-time monitoring, notifications, and video playback.
- Long-Lasting Battery: Built-in 5100mAh rechargeable battery for extended use without frequent charging.
- Cloud Storage Support: Securely saves recordings in the cloud for safe and easy access.
Important Notes
- When installing with adhesive backing, allow 24 hours for the adhesive to achieve optimal strength. Recommended installation height is 1.5 meters. Avoid installing on metallic surfaces where possible.
- Requires connection to a 2.4GHz Wi-Fi network. Not compatible with 5GHz networks and cannot operate without internet connectivity.
- The Xiaomi Smart Doorbell 4 is the Chinese version. Users must switch the Mi Home App region to Chinese Mainland for compatibility. Not supported with the Global Version of Mi Home.
Technical Specifications – Doorbell (MJML04BY)
- Product Name: Xiaomi Smart Doorbell 4
- Model: MJML04BY
- Region: China
- Rated Input: 5V = 2A
- Wireless Connections:
- Wi-Fi IEEE 802.11 b/g/n/ax (2.4GHz)
- Low-power Bluetooth
- 433MHz connection
- Battery Capacity: 5100mAh
- Storage Method: Cloud storage
- Working Temperature: -10°C to 45°C
- Charging Temperature: 0°C to 45°C
- Supported Systems: Android™ 8.0 and iOS 12.0 or later
- Execution Standard: GB 4943.1-2022
Technical Specifications – Smart Doorbell Receiver (MJJSQ01BY)
- Product Name: Smart Doorbell Receiver
- Model: MJJSQ01BY
- Region: China
- Rated Input: 100-240V~ 50-60Hz 0.04A
- Wireless Connection: 433MHz
- Operating Temperature: -10°C to 45°C
- Operating Humidity: 10% – 90% RH (non-condensing)
Why Choose the Xiaomi Smart Doorbell 4 MJML04BY?
- Wide 160° coverage and HD clarity for peace of mind
- Infrared night vision for 24/7 protection
- Easy integration with Mi Home APP (CN)
- Long-lasting rechargeable battery with efficient power usage
- Cloud storage for secure video recording
- Compact receiver for instant chime alerts indoors
The Xiaomi Smart Doorbell 4 MJML04BY is a reliable, feature-rich smart doorbell solution for modern homes—offering clear visuals, smart connectivity, and round-the-clock monitoring.
Whats’s the price of Xiaomi Smart Doorbell 4 MJML04BY in Bangladesh?
The price of Xiaomi Smart Doorbell 4 MJML04BY in Bangladesh is 6775 BDT

We will call you to confirm your order (between 11 AM – 7 PM). Kindly answer the call. If we are unable to reach you, please send us a message through our official Facebook page inbox.
Delivery Time
Inside Dhaka Home Delivery: 24-48 hours
Outside Dhaka Delivery: 24-72 hours
Delivery time depends on the courier service—usually 1–2 days inside or outside Dhaka. We use Sundarban, Pathao, eCourier, etc. Delays may occur due to courier issues.
Order processing and delivery time may be delayed due to stock issues, promotional offers, sale periods or other management issues.
Order Confirmation Payment Required
An advance payment of 100–200 BDT or more is required for order confirmation, depending on the product type and order amount.
Delivery Charge Details
Inside Dhaka: 60 Tk Only
Outside Dhaka: 120 Tk – If the product price exceeds 2000 BDT, an additional 10 BDT or 1% COD charge will be added for every 1000 BDT (as per courier policy).
Example: For a 3000 BDT product price, the delivery charge becomes 120+10=130 BDT, making the total 3130 BDT.
If you choose full prepayment, the 1% COD charge will be waived. Accepted payment methods: Bank Transfer, bKash, other Mobile Financial Services (MFS), Credit Card or EMI
Full Pre-payment / Partial Payment might required Outside Dhaka Courier, We’ll call you for further process & pre- payment details.
Full pre payment required for some specific or offer product, we’ll call you for details.
Note: For areas outside Dhaka City metro, including places like Savar, Tongi, Keraniganj, Demra, and similar locations, a 1% COD charge is applicable due to the courier company’s policy.Delivery charges may be higher than usual depending on the product’s size, weight, and quantity (e.g., fans, air purifiers, Home appliances & large items: Delivery starts at 100৳ in Dhaka, 150৳ outside.).
Fragile items may incur additional handling charges. We ensure all products are packed securely and delivered in excellent condition.
Important Usage Instructions
Always charge your device using a 5W/10W max or 5V:1A power adapter (recommended).
Warranty & Authenticity
We provide official dealer/distributor warranties only.
You can verify product authenticity by checking the distributor’s /dealers warranty sticker. This reflects our commitment to transparency and honesty.
Disclaimer:
1. For certain specific products, full prepayment is compulsory. Details will be provided during confirmation.
2. Backorder means the item is currently out of stock, but you can still place an order. It will be delivered once it becomes available again.
We reserve the right to cancel any order at any time, even after confirmation or advance payment. This is because issues can occasionally arise from the supply chain, delivery hubs, or dealer points. In such cases, you will, of course, receive a refund. Learn more from our Return & Refund Policy.
3. Charges are subject to change at any time or during promotional periods. If not updated on the website, we will inform you directly by phone.
4. Before placing an order, please verify the product’s color, stock, and current price via our Facebook Messenger. For every order, we will also call and reconfirm the details. Prices and stock are subject to change at any time due to updates from the dealer or distributor, and actual stock/price may change if central stock runs out. Since there are thousands of products on our website, it’s not always possible to update stock status or prices immediately, and occasional errors may occur.
5. Before making full payment, please confirm the product’s actual stock by contacting us via text or call.
6. After receiving the parcel from delivery man, Before opening the box of the product, must make an unboxing video from the complete packaging condition for any type of service & warranty. Customers must send a clear video & photo of the damaged, defective, or wrong product along with the shipping packaging for accurate verification under good lighting conditions.
Read more from Return & refund policy.
7. For a few days, the product must remain in its original condition—complete, fresh, and without any scratches—to qualify for a replacement, warranty, or refund. This ensures we can resolve any issues promptly and fairly. Thank you for your cooperation.
8. If you find any manufacturing problem issue after receiving, we’ll replace it instantly, must inform us within 24 hours after receiving the product for warranty service
Do not make any scratches; the product must be 100% fresh.
► Keep the small sticker on the device and product box intact. If the sticker is removed or scratched, you will not receive any service. You may remove the sticker later if you wish, but for long-term warranty purposes, please keep the box, all accessories, and stickers as they are.
Please read our complete Warranty Policy and Terms & Conditions before making a purchase.
For any assistance, please contact us through our official Facebook page inbox.
9. We sell only 100% authentic products sourced from verified importers.
Smart tools, smart gadgets, home appliances, smart gadgets are CN Region items. These are imported from China. Most of our items are also sold internationally.Please review product details and customer feedback before purchasing on your own.
10. No returns or refunds for personal preferences. Once opened, products are non-returnable unless there’s a manufacturing defect. In that case, a replacement is offered within 24 hours. We sell based on demand and do not provide servicing.
Note: Product information may change; actual packaging may differ. Always read the manual, labels, warnings, and directions before use. For details, contact the manufacturer. Any medical-related gadget is not a substitute for professional medical equipment. Do not use for self-diagnosis or treatment. Contact your healthcare provider if you have a medical issue. Extreme Gadgets is not liable for product inaccuracies or any health issues. We are not liable for any malfunction of the gadget or any harm caused to health.
Thank you for choosing Extreme Gadgets.
Your satisfaction is our priority.
Stay connected, stay extreme!
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