Thermostat Control by Phone Kit Code: HC-TKIT1 Price: $499.95 Quantity: This phone controlled thermostat is compatible with single or separate transformer heating/cooling systems. This thermostat works with almost all heating and cooling systems, including standard Gas/Electric, Heat Pump, Radiant, or Hydronic systems. It also works with single or multi-stage systems. The thermostat consists of two parts, a Wall Display Unit and an HVAC Control Unit. The Wall Display Unit provides users functions like a traditional thermostat and connects to the Control Unit by a 4 wire cable. The Control Unit connects at the HVAC system using the standard thermostat connections and provides the thermostatic temperature control of the system. The Control Unit also has the X10 Power Line Interface connection. In conjunction with a Telephone Responder (included in this Kit), it can receive commands via touch tone telephone. These commands can be to change heating or cooling settings in the thermostat, but also can be used to send commands to Lamp or Appliance Modules (not included in this kit). The Control Unit has a power line carrier interface that allows remote commands to be received and transmitted over the 110 VAC power line. The Telephone Responder answers the phone and sends the commands by the power line to the thermostat. Does not interfere with normal phone operation. This thermostat provides the latest technology in a full-featured universal thermostat with remote power line communications. It has many features including: Separate Heating and Cooling Set Points Multistage HVAC Systems Support Setup Mode from the Wall Display Unit Automatic Remote Sensor Detection Status LED Remote Signal Indication Selectable X10 Decode Table Bi-directional X10 Standard Enhanced X10 Protocol Kit Includes: RCTXB16 Thermostat and HC-XPPHC06 Telephone Responder. Also included with the kit are an X10 power line interface and cable. Manufacturer: X10 Wireless Technology, Inc Manufacturer warranty: 1 year Product questions: 800-442-5138