COMMUNICATING TELEPHONE ACCESS MODULE, THIS PROVIDES REMOTE TELEPHONE ACCESS TO THE HVAC SYSTEM, CAN BE USED WITH HEAT/COOL OR HEAT PUMP APPLICATIONS, USE THE TELEPHONE ACCESS MODULE TO:CHECK THE TEMP IN YOUR HOME REMOTELY USING A TELEPHONE,ADJUST THE TEMP SETTINGS REMOTELY, KIT INCLUDES:MODULE(W8735D1025),CHARGER(50018285-002)INPUT:100-240 VOLT,HERTZ:50/60,AMP:6, OWNERS GUIDE,INSTALLERS GUIDE. WEIGHT:1 LBS 11.9 OZ