Fangrui Product Details Open Window Detection: The Opening Of The Window Can Be Detected By A Rapid Drop In Temperature, And The Valve Will Suspend Heating For 30 Minutes, To Realize Energy Saving And Environmental Protection. Visual Display: Adjustable Brightness, Accompanied By Real-time Temperature Display Synced With The App Presented On The Screen That Offers A Visually Pleasing Experience. Flexible Screen Rotation: The Up And Down Directions Of The Screen Display Can Be Freely Adjusted Through The App To Ensure That Different Installation Directions Can Be Used Normally To Provide A Comfortable User Experience. Temperature Calibration: In Case Of The Temperature Variation Between The Floor And The Air, You Can Set The Calibration Value By App, To Make Sure The Final Temperature Reaches Your Ideal Value. Child Lock Function: This Function Is To Avoid Possible Overuse Of Electricity And Life Influences Caused By Mistake When Your Children Touch The Thermostat Radiator Valve. Technical Specifications: Power Supply: 3x 1.5 V