Aube By Honeywell TH115-A-240D-B/U Programmable Electronic Thermostat Advanced temperature control ensures total comfort by minimizing temperature swings On Standby switch enables thermostat shutdown at end of heating season for added security On-screen heating power indicator gives at-a-glance verification of power being used;Supply Voltage 240 Vac 15A. Temporary bypass enables temperature override without changing programming Battery-free backup means no re-programming thermostat after power outage