The RX Sensor is a Passive Infrared Motion Sensor (PIR) which can link to the RX Light, RX Receiver and RX Remote. When the RX Sensor picks up movement it communicates with the paired device, triggering the RX Receiver or illuminating the RX Light Requires 2 x AA batteries 2 Sensitivity settings 2 Mode settings; Floodlight and Security Weatherproof sealed case Sealed Battery Cover Hardcase included for storage and transport Digital circuitry