[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 ...

keypad tamper alarm, power failure alarm, battery failure alarm, battery under-voltage alarm, PSTN offline alarm, network disconnection alarm, IP conflict alarm, and MAC conflict alarm 2-channel ...

keypad tamper alarm, power failure alarm, battery failure alarm, battery under-voltage alarm, PSTN offline alarm, network disconnection alarm, IP conflict alarm, and MAC conflict alarm 2-channel ...