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Features: * Ultra-low power magnetic dedicated microprocessor. * Supports wireless frequency of 433.92MHz. * 200m wireless transmit distance. * Built-in antenna provided. * Less than 1μA quiescent current.Specifications: Support Battery: 12V 23A Wireless frequency: 433.92MHz Protocol: EV1527 Quiescent current: ≤5μA Emission current: ≤10mA Operating environment: -10℃-50℃ (14℉-122℉) Battery type: L1028 (Note: this model doesn’t come with batteries) Item Size: 77*49.5*18.8mmPackage Information: Package Size: Approx. 9.5*5.6*3cm/3.7*2.2*1.18in Package Weight: Approx. 45g/1.59oz Packing List: 1 * Sonoff DW1 Sensor