The BN-LINK digital cooling controller is designed to control the cooling devices in order to optimize crop-specific growing requirements. Easy to use, a digital display controls the devices' output temperature, which ranges from 40 to 108 °F (5 - 42°C). Depending on the user's preference, the temperature can be toggled to display in degrees Fahrenheit or Celsius. Our digital thermostats feature a standard, three-prong ground plug and are compatible with all heat mats. Provides constant optimal temperatures. Protect your safety with isolated strong wires and ETL certificate. How to adjust temperature setting: Press and hold ‘Set’ button for 3 seconds to enter the temperature selection mode, Press ‘Up’ or ‘Down’ button to adjust the temperature, press ‘Set’ button again to select the displayed temperature as the target, Press ‘Set’ button to display the preset temperature. The current measured temperature will be shown when no button is activated.