Ideal Security SK617 Portable 4-Zone Motion Sensor Alarm Motion sensor detects motion and activates built in 105 dB alarm or chime Detects motion in a 10 degree arc with range of 23 feet Expandable 4 zone wireless receiver, add up to 8 wireless devises Wired expandability with input terminals including wired sire Remote control with panic button included, battery low indicator, 3 AAA batteries included