Features: Smart thermostat that can be controlled by your phone before you come back home. Wall mount or tabletop installation style meets your different needs. Pairing the thermostat with receiver, then the receiver can enforce heating, more flexible to use. 3 power supply mothods: 2 x AAA batteries (NOT INCLUDED), DC 5V USB charging, AC230V wiring. Create thermostat group to centralized control and support device sharing. Compatible with Alexa and Google Assistant for hands-free voice control. 6 periods can be set each day, free to choose manual mode or auto mode. Backlit LCD display for easy reading, touch button to make simple operation. Keypad locking function is designed to prevent children from operating by mistake. With anti-froze function to prolong the service life of the device. 1 accuracy keeps temperature within the level you set. Suitable for gas boiler or hot water heating. Perfectly suitable for homes, offices, shopping malls, hotels, etc. Note: (GA) is suitable for water heating (GC) Only applicable to boiler heating Specifications: Material: PC Color: White Voltage: 230V LZad Current: 3A Temperature Sensor: NTC Temperature Accuracy: 1 Temperature Setting Range: 5-90 Protection Level: IP20 Wireless Transmission Distance: 100-200m Wireless Frequency: 868MHz or 433MHz (Two-way FSK) APP: Tuya Power Supply: 2 x AAA Batteries (NOT INCLUDED), DC 5V USB Charing, AC230V Wiring WiFi functionality is not supported when running on battery power Item Size: Thermostat: 135 x 87.5 x 23.2mm or 5.3 x 3.4 x 0.9in Receiver: 86 x 86 x 26mm or 3.4 x 3.4 x 1.0in Package List: 1 x Smart Thermostat 1 x Receiver 1 x Set of Installation Screw 1 x USB Cable 1 x Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.