Quiet working thermostat. Important: Read before operating instructions, then batteries in! The initial start-up is described in some branches, not ideal for complete non-technical (you forgive me) I would like to see here a "Stritt step guide" for everyone and what you see at every step in the display. Ok, the manual is not bad, but room for improvement. The exchange is no problem. Adapters are included. Is not very big, looks good. Adjust very quiet.