GE Wireless Door / Window Alarm 4-digit keypad code activates and deactivates alarm - user selectable code. 120 dB alarm sounds when magnetic contact is broken. Comes with two (2) Contacts. Delay feature allows you to enter and leave without activating the alarm. Operates in alarm or chime mode. Low battery indicator. Requires 3 "AA" Batteries (not included). This is a GE SmartHome Product. Easy to Install. Instructions included.