Window and Door Entry Alarm

Features:
Compact design, no wiring required
Magnetism control design with steady capability
High sensitivity can be used to protect people against stealing
Easily mounted to windows or doors with included double-side adhesive tape
Electronic Magnetic Sensor detects entry
Alarm is activated when the two pieces are separated
Turn the switch to ON to 'arm' unit
When someone enters or opens a door or window it will emit a loud 90db alarm until door or window closed
Ideal choice to guard against thefts in house, schools, offices, other places
Powered by 3 x 1.5VLR44/AG13 button cell (included)

Specification:
Dimension: 9.0*12.5*2.0 cm
Weight: 0.08 kg