The mechanical thermostat temperature controlling range is from 0Celsius to 60Celsius, perfect for using to control heater.The adjustable button is for easy and convenient to adjust the controlling temperature When the ambient temperature is lower than the temperature set by the thermostat, the circuit close and the heater equipment starts. When the ambient temperature is higher than the temperature set by the thermostat, the circuit is disconnected and the heater equipment stops The bottom of KTS011 mechanical temperature controller switch is with 2 wire interfaces,which can make wire connection become more sturdy The mechanical temperature control switch mainly use for controlling heating applications About temperature : Temperature deviation about 10 degree Celsius Name: Cabinet temperature control switch, Features: heating and heat dissipation, accurate temperature control, simple setting. The product is suitable for barriers, ATM machines, outdoor power distribution cabinets, cabinets, and vending machines. Colour:red Material:ABS Size: 60 x 33mm Package Contents: 4 x thermostat Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.