--This Choice basic mechanical room thermostat is an economical and simple to use room thermostat.--Simply turn the mechanical control dial to your desired temperature to control your room temperature.--This unit also produces an audible click when you turn the dial past the current temperature so you know when the system is being turned ON or OFF.--This mechanical 2 wire thermostat is very easy to install and having volt free contacts is suitable for systems with either a combination or normal boiler. If you have a three wire installation, simply cut back and makesafe the neutral and this two wire thermostat will give you years of faithful service.--Designed to provide simple automatic ON/OFF control for your heating systems, by sensing the air temperature and switching on the heating when the air temperature falls below the thermostat setting and switching off when temperature is reached.Feature:Dual diaphragm temperature sensing elementSuitable for surface or patress box mounting10 to 30C Set point range10 Amp current rating2 Wire InstallationPower Supply: 220V Ac, 50-60HzTemperature setting Range: 10C to 30CCurrent Rating: 10(3) AmpTerminal Differential: Approx 4COperating Temperature Range: -25C to 55CDimensions: L83 x H83 x D31mmPackage Included:1PC Thermostat Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.