Tuya Zigbee Thermostatic Radiator Valves Intelligent Wireless Mobilephone App Control Home Heating Thermostat Temperature Controller Radiator Thermostat Compatible with Amazon Alexa Home This product is a radiator thermostat, suitable for home heating equipment. Convenient installation and simple operation. The temperature can be controlled through the mobilephone app, so that you can enjoy the appropriate temperature as soon as you get home. Specifications: Frequency: 2.4GHz Thread: M30*1.5mm Battery: 2 * AA battery (not included) Stroke: maximum 5mm Temeprature range: 5℃-35℃ Temperature display: 0℃-50℃ Working temperature：-10℃- 40℃ Item size: 94 * 55mm / 3.7 * 2.2in Package size: 105 * 96 * 96mm / 4.1 * 3.8 * 3.8in Package weight: 194g / 6.8ounce