ITEM NAME:Rex-C100 Digital Pid Temperature Controller Thermostat SSR Output + Max.40A P7L1 Rex-C100 Digital Pid Temperature Controller Thermostat SSR Output + Max.40A P7L1 REX-C100 Temperature Controller Range:0 to 400 Celsius K Output:SSR Indication for you:if your voltage is between 100V--240V like 110V or 240V , you'd better choose AC100V--240V 50/60HZ, if your voltage is 220V, you can use both AC100V--240V 50/60HZ and AC220V. Color:black + silver Material:metal + plastic Size:sensor diameter 5mm Package Contents: 1 * Temperature controller 1M thermocouple probe 1 * SSR 40DA relay (with stand).1 SSR 40DA relay (with stand).