SDITERSMT WIFI Radiant/Electric Heating Boiler Knob Thermostat For 100 percent Relay Switch/Dry Contact Passive Control 24V 220VOn Appearance1. LED display, extra friendly interface;. LED matrix light, uncomplicated display, energy saving, protect your eyes. 2. Touch buttons to make simple operation. 3. The ultra-thin embedded panel completely suits all kinds of walls; The visiable thickenss above the wall is just 12. 4. Frameless acrylic panel design, straight forward and elegant; 5. Classic black/white colour scheme, seamlessly integrated. 6. Compatible with ordinary 86mm square cassettes and 60mm European cassettes to satisfy all set up environments; 7. Interlock to attach will offer you clean installation. On Functionality 1. Rich function options, Modbus, WIFI, keycard, etc, to satisfy all of your needs; 2. Strict temperature management accuracy (± 1°C) to supply the heat you want; 3. Power off protection, save all your settings safely; 4. Preset adjustment of 5+1+1 mode in a week, programmable environment of 6 time periods a day, green energy saving, Less cost, more clever and environmental protection; 5. Support the advent of product local groups/shares to achieve limitless centralized management of the number of products/ multi-terminal control; 6. Perfect access: Tmall Genie, Amazon echo, Google Home, total journey new voice management method; Delivery list1* Thermostat1* External sensor (GB16A model only)2* Mounting screws1* User instruction manual for thermostat (in English)1* Screwdriver