The Sonic Alert Sonic Bomb alarm comes with two parts -- the classic display and incredibly loud buzzer and the vibrating attachment that you can slip under your pillow. You can customize the ...

[Adam]’s homemade freezer failure alarm is a cheap and open solution that ticks all the boxen. It runs on mains power and uses a 100dB piezo buzzer for ear-splitting effectiveness to alert [Adam ...

A simple, low-cost Vehicle Theft Detector device can effectively alert homeowners or occupants if a parked vehicle is moved ...