... Model 509 Programmable Heating Thermostat509 series, large LCD digital thermostat, 110/220VAC±10%,16A thermostat for hot water radiant heating systems ... time settings, Monday to SundaysLarge Back-lit display, LCD Screen, easy-to-see and readInfrared remote-controlled function ... mistake operations(option)Product Specifications:l Voltage:110(±10%)VAC/220(+10%,-15%)VAC,50/6OHzl Differential Temperature:1° ...