The TH115A240D 7-day programmable thermostat has an LCD screen to display temperature, time, day, mode, heating command. The unit operates on 240 V and requires a four wire installation. Relay switching means 15 minute cycles to provide precise temperature control ± 0.9°F (0.5°C). It is equipped with input for use with CT241-01 telephone controller. Rating: 3600 W @ 240 V, 15 A resistive load, 60 Hz, DPST.