The TR-104 programmable digital room thermostat has a clear display and intuitive interface and, combined with the offered functions, meets the highest expectations of users. A characteristic feature that distinguishes this thermostat on the market is the built-in calendar function with which it is possible to program the thermostat's weekly operation mode. The additional function of vacation mode, as well as a number of other functions used in the thermostat makes it an extremely attractive solution for automating the process of controlling heating and air conditioning systems.