Powerful 110db siren siren sounds when door or window is opened mounts onto most door or window frames 2 modes alarm or door entry chime this windowdoor alarm is operated using a 4 digit pin code with the keypad on the front of the alarm the alarm can be set to either announce visitors with a chime when the magnetic contact is broken or switched to alarm mode sounding a loud 110db siren when an intruder is detected features powerful 110db siren sounds when door or