AS SEEN ON TV THIS ALARM IS MOUNTED PERMANENTLY ONTO YOUR DOOR OR WINDOW WITH DOUBLE-SIDED TAPE (INCLUDED). AS SOON AS ANYONE TRIES TO OPEN THE DOOR/WINDOW THE MAGNETIC CONTACT IS BROKEN AND A
SOUND OF 90 DECIBELS WILL AUTOMATICALLY BE ACTIVATED. YOU CAN ONLY RSET THE ALARM BY CLOSING THE DOOR/WINDOW. IF YOU DON'T WANT THE ALARM ACTIVATED THERE IS AN OFF SWITCH ON THE UNIT.