Select 120 dB siren or pleasant chime to sound when any movement is detected in room. No-wiring, easy installation, detects motion up to 30 ft away. Adjustable sensor head provides 110° coverage within a 180° area. Remote control on/off operatesup to 25 ft Indoor use only. Automatic reset after activation. 45-second exit/15-second entry delays, continuous alarm while motion detected (lasts 1 minute after). Mount on wall or use freestanding. 1 remote control unit with 1.5 volt button cell batteries. Alarm uses three  AA batteries [not included].