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🚨 Stay ahead of intruders with the BT51D’s smart, loud, and wire-free security!
The BlackT Electrotech BT51D is a compact, battery-powered wireless doorbell and window alarm sensor delivering a piercing 120dB alert. Designed for easy peel-and-stick installation, it functions as a 4-in-1 security device—doorbell, alarm sensor, emergency alert, and calling bell—perfect for homes, offices, and cabins seeking hassle-free, effective protection.
| ASIN | B0DBJ2R2K4 |
| Audible Noise | 120 Decibels |
| Battery Description | Alkaline |
| Best Sellers Rank | #7,907 in Home Improvement ( See Top 100 in Home Improvement ) #9 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 95 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 |
| Number of Items | 1 |
| Packer Contact Information | Blackt Electrotech |
| Power Source | Battery Powered |
| Sensor Technology | Contact Sensor |
| Size | Small |
D**V
Good product
Good product overall. Just make sure to carry some extra batteries with you. The sound is incredibly powerful—even when I know where it is and what it’s about, it still makes me panic when it goes on! 😄
B**A
Nice product, solve the purpose
Ding dont sound is there but it is not music to the ears, more towards alarming side rather than music. I must say, still it fulfills the purpose for which it is designed for. It has 3 modes, useful.
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**I
Bad customer care
I had ordered it and initially was very happy but it stopped working suddenly. First we changed the battery but that didn't work. We connected with seller / manufacturer but there was no proper response. We were asked to send a video which we have done 2 times but they don't revert. Customer service is very bad.
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
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*.
A**D
Good product
Good
P**R
Should be little less
Too much noise
Trustpilot
4 days ago
1 month ago