The Trolmaster TSH-1 Temperature / Humidity Station is a 0-10 volt analog output control station that works with the HCS-1, HCS-2 and HCS-3 controllers. The TSH-1 can be configured to control either a temperature or a humidity device that requires a variable 0-10 volt input signal. The TSH-1 is capable of controlling variable speed fans, vents or any other device that accepts a 0-10 volt input. It features separate day and night “idle” speed settings built-into the TSH-1 as well as separate Day / Night setpoints accessed through the HCS controller. *Firmware Update Note: To update firmware on the TrolMaster's controllers and modules, you must use a Micro SD card that is 32GB or less capacity.