The Link2Home Smart Alarm Door/Window Sensor provides up to 80m open field Zigbee transmission (3.0). It can be used with other Link2Home devices, or used to trigger them. This includes lighting. Battery powered (supplied) with low power indication and tamper protection. Requires smart alarm hub (L2H-SECUREGWAY), includes spacers. Specification: Transmission Range: 80mBattery Life: up to 24 months Ref: UTTK878