Quantity: One Piece Color: Red Knob (Normally Closed) 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 you to set and control the temperature. The color of the thermostat's knob (red/blue) 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 standard rail clip, 1.2m bracket, easy to install and remove. Function: When the ambient temperature exceeds the temperature set by the thermostat, the thermostat will automatically start the cooling fan/fan to dissipate heat to avoid damage to the chassis equipment due to excessive temperature. Detailed explanation: Hollow strips: The precise strip design allows the double gold foils inside the thermostat to be fully in contact with the air, so the thermostat is more sensitive and can respond quickly to ensure the safety of the equipment. Terminal: 2-pole terminal 2.5mm2 wire 1 is the incoming wire of the under wire voltage, 2 is the wire coming out of the neutral wire to support wide voltage input from 12 to 250 V.Good quality product