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 * 86mm / 3.39 * 3.39in Package Weight: 210g / 7.41ounces Package Size: 100 * 100 * 60mm / 3.94 * 3.94 * 2.36in Packing List: 1 * Manual Thermostat 1 * Sensor Cable 2 * Mounting Screws 1 * 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.