Simple to wall mount or can be used free standing, the 130 dB Alarm will sound if motion has been detected and the correct 4 digit PIN code has not been entered within 10 seconds of entering. Runs on 4x AA batteries (not included) and a low battery light will warn when batteries are running low.
Very easy to use and does a good job. Additional sirens can be added and that offers another layer of security. IMO this is a practical and helpful security device, I have two and never had any issues or problems with them.