A. This Choice basic mechanical room thermostat is an affordable and easy-to-use room thermostat. B. Simply turn the mechanical control knob to the temperature you want to control the indoor temperature. C. When you turn the knob beyond the current temperature, the device will also emit an audible click, so you can know when the system turns on or off. D. This two-wire mechanical thermostat is easy to install and has voltage-free contacts, suitable for combined or ordinary boiler systems. If you are doing a three-wire installation, simply cut off the neutral wire and handle it safely, and this two-wire thermostat will provide reliable service for many years. E. This thermostat is designed to provide simple automatic on/off control for your heating system. By sensing the air temperature, it turns on the heating when the air temperature drops below the temperature set on the thermostat and turns it off when the set temperature is reached. Features: - Dual-diaphragm temperature sensing element - Suitable for surface or junction box installation - Setpoint range from 10 to 30°C - Rated current of 10 amperes - Two-wire installation Power Supply: 220V AC, 50 - 60Hz Temperature Setting Range: 10°C to 30°C Rated Current: 10(3) amperes Terminal Temperature Difference: Approximately 4°C Operating Temperature Range: -25°C to 55°C Dimensions: Length 83 x Height 83 x Thickness 31 mm Package Contents: 1 thermostat