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MEK-CD101 Wireless door sensor Working voltage: 3V (2 AAA alkaline batteries); Wireless transmission distance: ≥150 meters (open place); Transmitting frequency: 433.92MHZ/315MHZ/868.4MHZ (optional) Launch agreement: 1527; Quiet current: ≤2μA; Emission current: ≤15mA; Working environment: -10℃~50℃ (14℉~122℉); Anti-dismantling switch: normally closed; Product size: 72*45.5*14mm