Intermatic WINDOW ALARM

Magnetic sensor detects the opening of doors/windows. Piercing 90dB alarm. No wiring, mounts with double sided tape to window/door frame. On/Off switch, operates on 3 replaceable 1.5V A613 button batteries (included). Ivory. Refer to the 8000 department for replacement batteries. Compatible ones are: Eveready model No. 399, Duracell model No. D395/399 for the model No. SP440 window/door alarm.