Specification: Version: Zigbee, WiFi (optional) Power: 3 x 1.5 V AA batteries (not included) Accuracy: 0.5°C Setting temperature range: 5~35° Storage temperature: -5~ 45 °C Surface temperature: 90℃ Max (at the radiator) Connection: m30*1.5mm Linear stroke: 4.3 mm Protection class: IP 20 Application: Tuya Smart/Smart Life APP Voice Control: for Amazon Alexa, Google Assistant Size: about 58.4*97*58.4mm/2.30*3.82*2.30inch Note: 1.Tuya ZigBee version, as ultra-low power ZigBee technology with Tuya ZigBee hub need higher compatibility than other hubs for simple Tuya Smart APP access. 2. WiFi smart long battery life thermostatic radiator valve, no Tuya ZigBee hub required, just configure WiFi to Smart Life APP to wirelessly control your home's radiator valve. 3. The battery you use and the router in your home will affect the battery life, please confirm that you are using an alkaline battery. 4. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 5. Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 * TRV (without battery) 1 * User Manual 6 * Adapter 1.New Fashion and Generous Design with Rotatable Screen:New LED dot display with super torque output. Differs from original traditional display on the valve body resulting in reading trouble from the installation position, this new version is featured as rotatable screen that allows you to read it from different angles, providing with much more comfortable user experience; three sections of AA alkaline batteries powered,which is a special valve using cooperatively with heating radiator for greatly reducing the power consumption with measured testing results of consuming 23.592mAH of energy per day and can be used for about 76 days. 2.ZigBee Smart Long Battery Life Thermostatic Radiator Valve with Tuya ZigBee Hub Required:This is the new ZigBee type as ultra-low power ZigBee technology with Tuya ZigBee hub required for higher compatibility than other hubs for simple Tuya Smart APP access,wireless controlling your house radiator valve no matter where you are via smart phones with Auto and Manual mode optional in APP to enjoy the most comfortable temperature and cost-saving way without purchasing a hub;together with anti-scale for preventing minerals in the water from clogging the valve. 3.Programmable Schedule with Weekly Programming Selection:Supports manual set weekly schedule with 4 periods for each day, providing you with the maximum convenience for different situation and setting customized schedule for your house temperature. Auto mode,manual mode and ON/OFF mode are optional for added convenience; Energy saving in a real sense with temperature ceiling and lower limit setting functional in APP. 4. Alexa and Google Home Compatible:Using simple voice command for house temperature control for more convenient life experience by adding our smart radiator valve controller into Smart Life APP before being linked by Alexa or Google Home; Window check and temperature calibration are supported in APP for added convenience.