The heating thermostat is manual switch and knob operation, acquire the room temperature with its floor sensor. Features: It controls the temperature with an NTC sensor placed externally. Indicator lamp is light when heating is on. With manual switch and knob for easy operation. Can fit into a standard single switch backbox. Full installation and operation instruction included. Specifications: Material: PC Color: White Voltage: 230VAC Power Consumption: 5W Temperature Control Range: 5-40℃  Temperature Limit Range: 25-55℃  Energy-saving Temperature: 5℃  Temperature Switch Deviation: 0.5K  Ambient Temperature: -5-50℃  Shell Protection: IP20  External Sensor: Lead length of 3.0m Item Size: 86 x 86mm / 3.39 x 3.39in Package Weight: 210g / 7.41ounces Package Size: 100 x 100 x 60mm / 3.94 x 3.94 x 2.36in Packing List: 1 x Manual Thermostat 1 x Sensor Cable 2 x Mounting Screws 1 x User Manual 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.