Wireless with antimasking technology external infrared motion detector of 2 pyroelectric elements by OPTEX. 12m range, 16 coverage zones and 90o angle. It is placed at a height of 0.8-1.2m. Detection speed: 0.3~1.5m/sec. Sensitivity: 2oC @ 0.6m/sec. Features 5 levels of distance adjustment and temperature compensation circuit, Operating voltage: 3-9VDC (lithium or alkaline battery). Consumption: 10μA (standby) / 4mA (MAX) @ 3V, IP 55. Dimensions: H181.9 x W70.9 x D64.5mm. The transmitter and batteries are not included in the package.