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🚨 Secure smarter, not harder — your silent guardian with a loud voice!
The BlackT Electrotech BT51D is a cutting-edge 4-in-1 wireless door and window alarm sensor delivering a powerful 120dB alert. Designed for easy, wire-free installation, it combines doorbell functionality with advanced security features, making it ideal for homes, offices, and cabins. Compact yet versatile, it ensures instant notification of unauthorized entry, empowering you with peace of mind and modern protection.
| ASIN | B0DBJ2R2K4 |
| Audible Noise | 120 Decibels |
| Battery Description | Alkaline |
| Best Sellers Rank | #4,861 in Home Improvement ( See Top 100 in Home Improvement ) #2 in Home Security Alarms |
| Brand | Blackt Electrotech |
| Built-In Media | magnet |
| Colour | white |
| Compatible Devices | Home Security System |
| Control Method | Touch |
| Country of Origin | China |
| Customer Reviews | 4.1 out of 5 stars 83 Reviews |
| Importer Contact Information | Blackt Electrotech |
| Item Type Name | Door sensor |
| Item Weight | 80 Grams |
| Manufacturer | Blackt Electrotech |
| Model Number | BT51D |
| Mounting Type | Door Mount |
| Packer Contact Information | Blackt Electrotech |
| Power Source | Battery Powered |
| Sensor Technology | Contact Sensor |
| Size | Small |
S**I
must needed
must needed one for single man store owner , whenever someone opens the door it will give a heavy sound. i am using for 5 months battery is yet to replaced worth for money quality is too good
N**A
Useful 'Door Open' alarm
It is good for door open alarm/warning. It has 4 different settings, which are useful. The manual could be better designed but it is not difficult to figure out.
S**G
Good Product
Product working flawlessly
A**D
Good product
Good
P**R
Should be little less
Too much noise
T**S
Sound Quality & Look
Sound is super loud. Installation is easy. Device looks good. Liked it at first sight. Just feeling sad that after ordering it, price got reduced by 107Rs. Now, let's see how it works in future after which will again share review here. Till then stay secure stay safe. Edit 1 - Order 2nd piece whose button is somewhat hard to slide as compared to 1st one which is smooth. Hence, instead of 5* giving 4*.
P**R
Great product
Working great. And has 4 modes. 2 modes with siren type sound alerting everyone. Other 2 has single doorbell type warning sound and beep sound. So both loud and soft sounds present so can be used in day to day purpose
A**K
Bought two. One works fine. Another one stopping working within a month.
I bought two of them. One works fine. Another one stopped working within a month! Changing batteries or trying working batteries from the other unit didn't help. Could be a hit or miss...
Trustpilot
4 days ago
1 month ago