You would like to protect your home from unexpected visitors? This mini alarm can be mounted using strips of adhesive tape or with screws. How it works: if someone opens a door or cupboard, the contact between the alarm system & magnetic strip is broken & it emits a piercing loud alarm signal. Ideal for smaller objects like doors, cupboards, windows, drawers etc. The alarm is activated via the magnetic contact. There is an on / off switch. You will receive: 3 alarm units & adhesive tape & the batteries required (9 x LR44 coin cells)