Quantity: one piece Color: blue button (normally open) Material: The thermostat shell is made of high quality plastic material, with fine workmanship, environmental protection, safety and durability . 0-60 Temperature Controller: Its temperature control range is 0-60. It is ideal for controlling heaters, filter fans, cooling devices and other signaling devices in your home, market, etc. Adjustable: The data scale is large and the adjustable knob is convenient for set and control the temperature. The button color (red\/blue) of the thermostat can be selected for you. Sturdy and safe: The circuit interface at the bottom of the thermostat makes the wiring stronger and safer. Easy installation: With clip of standard rail, 1.2m bracket, easy to install and remove. Function: When the room temperature exceeds the temperature set by the thermostat, the thermostat will automatically start the fan\/cooling fan to dissipate the heat in order to to prevent damage to chassis equipment due to excessive temperature. Detailed explanation: Hollow bands: The precise design of the bands allows the double gold foils inside the thermostat to d be fully contacted with the air, so that the thermostat is more sensitive and can react quickly to ensure the safety of the equipment. Terminal: 2-pole terminal 2.5 mm2 wire 1 is the incoming wire live wire, 2 is the wire coming out of the neutral wire to support 12-250V wide voltage input.