In order to create a safer smart home, this thermostatic valve incorporates a child lock feature to reduce child misuse. This thermostatic valve supports voice control and remote control of the phone, you can adjust the temperature of the radiator anytime and anywhere. It is constructed of abs material. The length of this product is 5.5cm, the width is 5.5cm and the height is 9.4cm. It is suitable for home, office, and dorm, etc. Item Name: Thermostatic Valve Material: ABS Features: Voice-Control, Children Lock, Phone Timing, Group Control Power Supply : 2 x 1.5V AA Batteries(Not Included) Temperature Sensor: NTC Temperature Accuracy: 1 Degree Celsius Display Range: 0-60 Degree Celsius Battery Life: Half A Year Temperature Setting: 5-60 Degree Celsius Applicable Temperature:0-50 Degree Celsius Constant Temperature Tolerance: 1 Degree Celsius Wireless Protocol: Works with Zigbee 3.0 Frequency: 2.4G Maximum Route: 6mm Operating Temperature: -10-40 Degree Celsius Voice Control: for Amazon Alexa, for Google Home Size Details: LxWxH: 5.5cm x 5.5cm x 9.4cm/2.17" x 2.17" x 3.7"(Approx.) Notes: The gateway need to be used works with Smart ZigBee thermal thermostat valve. 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. Package Includes: 1 x Thermostatic Valve 1 x User Manual