The ProperAV Window Alarm with Keypad & Loud 110dB Siren with easy to use keypad controlled alarm is suitable for use anywhere in the home or business. Simply set a secure 4-digit passcode and an alarm will sound when any movement is detected. It can be either be set to announce visitors with a chime or switched to alarm mode sounding a loud 110dB siren when an intruder is detected. Requires 3x AAA batteries - not included