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Note that: ONLY Cooperating with the infrared host, the SONOFF PIR2 sensor could work with Amazon Alexa. And it could also be compatible with Google Home / Nest when it works with other products that can work with Google Home / Nest.Features: * Dual infrared. * Ultra-low power microprocessors. * Double temperature compensation technology. * Easy installation and set-up.Specifications: 433MHz Transmit distance: 150m (open) Voltage: 3V (2*AA) Standby current: ≤9μA Alarm current: ≤10mA Wireless frequency: 433.92MHz Wireless Transmit Code: 1527Mhz (default) Detection distance: 12m@ 25℃ Detection angle: 110 degrees Maximum coverage area: 12m*12m Alarm indicator light: on for 3 seconds Working environment: indoor Tamper switch: normally closed Anti-white light intensity: 10000Lux Battery type: 2*AA (not included) Item Size: 120 * 62 * 46mmPacking List: 1 * Sonoff PIR2 Sensor (without batteries)