1. Compatible with gas boilers: Check before purchasing. 2. Smart WiFi control with app: Control the device and set the desired temperature range to keep your home always warm before you arrive. 3. Energy saving: 5 working days + weekend 24 hours programmable time (can be set for any period and for a specific temperature): Works automatically to save energy considerably. 4. You can control it by voice from anywhere in your home 5. Easy to use To install: Terminals 1 and 2 must be connected to AC power (AC95-240V); Terminals 6 and 7 must be connected to the boiler.