The Trolmaster Humidistat Station Pro 24V (HS-1) is used to control commercial dehumidification factors. It eliminates the need to control the high energy/start-up current associated with dehumidifiers. The HS-1 functions like an external humidifier and is ideal for larger dehumidifiers. The kit includes 1x Humidistat Station (HS-1), 1x 16ft RJ12 cable, 1x 4ft RJ12 cable, 1x RJ12 T-splitter and 1x RJ12.