Wi-Fi router 802.11G running WPA2 security or no security
Always on internet connect (cable modem, DSL etc.)
Wireless PC with  XP, Vista, 7 or 8
Or
iPhone/iPad/iPod Touch
or
Wireless Mac or Lenox system *
 “C” wire connect on the thermostat (used to power Wi-Fi card and thermostat)
*(requires Manual Set up)