Digital clock thermostat with external switch box and weekly program, operation via app, direct Bluetooth low energy connection (BLE) between app and RAMSES BLE, no communication via the Internet, settings conveniently via app with intuitive operation from smartphone or tablet, 1 x relay 10 A potential-free, 1 x relay 5 A, potential-free, for heaters with 2-stage control, hysteresis adjustable between level 1 and level 2, (temperature difference between actual room temperature and target room temperature adjustable from 0.5 °C to 2.5 °C in 0.5 increments), heating and cooling function possible, heating from 20 °C downwards with relay 1, cooling start temperatures (range 20-30 °C), waiting time adjustable to switch between heating and cooling (1-50 hours), increased ease of use, no display on the device, changeable basic programs, programmable switching times, Optimization function, frost protection