BHT-15 Smart WIFI Thermostat For Water Heating/Boiler/Electric Heating FEATURES On Appearance 1. LED display, more friendly interface;. LED matrix light, simple display, energy saving, protect your eyes. 2. Touch buttons to make simple operation. 3. The ultra-thin embedded panel perfectly fits all kinds of walls; The visiable thickenss above the wall is only 11.5mm. 4. Frameless acrylic panel design, simple and elegant; 5. Classic black/white color scheme, seamlessly integrated. 6. Compatible with standard 86mm square cassettes and 60mm European cassettes to meet all installation environments; 7. Interlock to connect gives you easy installation.   On Functionality   1. Rich function options, Modbus, WIFI, keycard, etc, to meet all your needs; 2. Strict temperature control accuracy (± 1°C) to provide the warmth you want; 3. Power off protection, save all your settings safely; 4. Preset adjustment of 5+1+1 mode in a week, programmable setting of 6 time periods a day, green energy saving, Less cost, more intelligent and environmental protection; 5. Support the creation of product local groups/shares to achieve unlimited centralized control of the number of products/ multi-terminal control; 6. Perfect access: Tmall Genie, Amazon echo, Google Home, full experience new voice control method;   Wiring Diagram :     Becasmart BHT2002 Heating Thermostat Smart Wifi Programmable Wireless Nest HVAC Heat Termostato Wifi for Office Household Home office