Provides a useful alert alarm when movement is detected in a driveway or entryway. The PIR motion detection has an effective range of up to 4-8m, and can transmit to the indoor unit up to 80m away. Battery powered so there's no messy wiring, while intelligent design provides up to 2 years of battery life. The indoor unit features a courteous chime with high, low and off volume, as well as an LED alert and low battery indicator. Includes adjustable mounting bracket for the PIR unit for optimal positioning and mounting hardware. 6xAA batteries required. Wireless Frequency: 433MHz Digital Wireless Range: Up to 80m PIR Angle: 90 degrees PIR Range: Up to 4-8m IP Rating: IP44 (Transmitter) Width : 62.0mm Height : 122.0mm Depth : 40.0mm Dimensions for : Transmitter Battery type : AA Battery quantity : 6.0pc Effective Range : 8.0m Doorbeam Speaker Output : 80.0dB, 100.0dB Dimension details : Receiver Width : 70.0mm Height : 130.0mm Depth : 26.0mm