Specifications:Material: ABSInput: 100-240V, 50/60HzOutput: 5V, 2AStandby Current: About 6uA for auxiliary machineStandby Time: 6 months for auxiliary machineCommunication Way: Wifi(2.4G)& 43;BLE moduleCommunication Frequency for Auxiliary Machine: 433MHzCommunication Distance for Auxiliary Machine: 80M (empty outdoor environment)Temperature Display Unit: /Humidity Display Unit: RH%Temperature Range & Accuracy: -20~60, 0.5Humidity Range & Accuracy: 0%~99%, 2%RHOperating Temperature: -20~60Auxiliary Machine Power Supply: 3V 1000mA, CR2477 button cellMain Machine Size: 160 * 23.5mm / 6.30 * 0.93inAuxiliary Machine: 45 * 15mm / 1.77 * 0.59inItem Weight: 355g / 12.52ozPackage Weight: 550g / 19.40ozPackage Size: 19.5 * 18.5 * 6.3cm / 7.68 * 7.28 * 2.48inPacking List:1 * Indoor Weather Station Main Machine1 * Indoor/Outdoor Wireless Sensor Auxiliary Machine1 * USB Cable1 * Manual (English, German, French)