The TS-2 can be used to control most HVAC systems including heat pump and multi-stage HVAC systems. The TS-2 is wired to the HVAC system using the same low-voltage thermostat cable, and has the standard color-coded wiring as most thermostats. The Hydro-x allows separate Day and Night settings for each of up to (4) TS modules, so multiple HVAC systems can be controlled by a single Hydro-X system. The TS-2 also has an adjustable delay time for each HVAC systems being activated. That minimizes high start-up (inrush current) and allows up to 4 HVAC systems to be safely controlled. Features: LCD Display, Easy Operation Seamless Connection with Hydro-X Micro-SD for Firmware Upgrade Address Assignment Plug & Play Specification: Output Voltage: 24V Maximum Current: 1A Working Environment: Temperature 32-122°F, Humidity=90% Packaging Dimensions: 160mm(L) x 86mm(W) x 86mm(H) Package includes: 1 x Thermostat Station (TS-2) 1 x 16ft RJ12 Cable 1 x 4ft RJ12 Cable 1 x RJ12 T-Splitter