Review on 🔋 Comimark 2Pcs 12V Low Voltage Buzzer Alarm Module - Under Voltage Protection for On-Board Battery by Doug Friedman

I took a chance because I need 2 simple low battery alarms and they are cheap. I tested at 12V on my variable power supply. The rather loud buzzer turns on at 12.0V and turns off at 12.2V. Turning the potentiometer clockwise increases the voltage at which it operates. I tested it at 24.0V and it got louder with a higher tone. I'm not sure if it can handle higher voltages without damage or reduced lifespan. I asked a question and received no response from the seller. I'm not surprised that the Chinese seller knows absolutely nothing about the product. In general, it's cheap and runs on 12V.