The Link2Home Smart Alarm PIR can be used with other Link2Home devices, including presence detection with lighting. It has up to 80m open field Zigbee transmission (3.0). Requires smart alarm hub (L2H-SECUREGWAY). Battery powered (supplied) with low power indication and tamper protection. Specification: PIR Detection Coverage: 8m/110°Battery Life: up to 24 monthsFixing: Surface Mount Ref: UTTK883