Some deliveries may take a little longer than usual due to regional shipping conditions.
DOWNLOAD THE APP
Customer Services
Copyright © 2025 Desertcart Holdings Limited
DOWNLOAD THE APP
🚨 Stay ahead of every step with BT51A — where security meets smart welcome!
The BT51A Wireless Motion Sensor Alarm by Blackt Electrotech combines an 8-meter infrared motion detector with a powerful 110-decibel alarm and customizable welcome tones. Designed for easy installation and versatile use, it offers dual functionality as both a security alert and a friendly doorbell, making it perfect for modern homes and professional spaces seeking smart, reliable protection.
| ASIN | B0DBL4D681 |
| Best Sellers Rank | #2,607 in Home Improvement ( See Top 100 in Home Improvement ) #5 in Motion Detectors |
| Control Method | Touch |
| Country of Origin | China |
| Generic Name | Motion Sensor Detector Gate Alert Alarm |
| Importer | Blackt Electrotech |
| Included Components | Remote |
| Item Dimensions LxWxH | 8 x 4.5 x 4.5 Centimeters |
| Item Weight | 150 g |
| Item model number | BT51A |
| Manufacturer | Blackt Electrotech |
| Maximum Range | 8 metres |
| Mounting Type | Wall Mount |
| Noise Level | 110 Decibels |
| Packer | Blackt Electrotech |
| Product Dimensions | 8 x 4.5 x 4.5 cm; 150 g |
| Sensor Technology | Infrared Sensor |
| Size | Small |
J**R
Allover funcation and utility
Very nice useful product. Having multiple usages like: When ever anyone is passing through its range,it gives the alert like: Any animal is passing, you can set the alert tone as dog barking If you want to welcome your guest, you car set the Welcome tone. Even you can set the tone of call bell. The Welcome tone is having multiple languages of your choice. It operates on 3 AAA Batteries or even with micro usb. I recommend this product may be used and installed near your main gate or even at front door of your house as you wish. Installation is very easy,anyone can do it on their own.
V**T
Good
Very good product allmost but range is only 8 feet other function like sound, and bell is very good
J**B
No. 1 sensor alarm product.
Received the order ontime. Super packing and amazing product. Thanks a lot🙏
N**I
Limited range 6-8 feet only.Not so good
It does not work beyond 8 feet,no return facility given,works OK within 6-8 feet.Wrong claim given in specification of product. Not good enough.
G**R
Warning bell with poor range (6')
OK. Poor range 6' only.
R**H
Volume, battry backup, size, motian quality all good
Good product
A**D
Not working prodect
It didn't have a remote, it's a non-working item It looks like it was used I'm in pain to hear that you got a product like this through Amazon.
P**K
Excellent product
Serve the purpose of an alarm 100% Very useful product to track movement of elderly ,small kids & at entry point of house or shop.
Trustpilot
5 days ago
1 month ago