The HS-1 Humidistat Station from TrolMaster is used to control commercial dehumidifiers. Most larger / commercial dehumidifiers have a “low-volt” control option so the dehumidifier can be controlled by an external humidistat. The HS-1 works and is wired exactly like an external humidistat. The HS-1 is the best way to control your dehumidifiers by eliminating the need to control the high-amperage / inrush current associated with dehumidifiers.   LCD Display, Easy Operation Seamless Connection with Hydro-X Micro-SD for Firmware Upgrade Address Assignment Plug & Play     Package Includes: 1 x Humidistat Station (HS-1) 1 x 16ft RJ12 Cable 1 x 4ft RJ12 Cable 1 x RJ12 T-Splitter Specifications: Output Voltage: 24V Maximum Current: 1A Working Environment: Temperature 32-122°F, Humidity=90% Packaging Dimensions: 160mm(L) x 86mm(W) x 86mm(H)