Comfort at its best!The wall units are ready to receive the USB key to use the optional Wi-Fi.CS11MCS11M-09HRFN1-MX0W(A), 25 SEER, 9k Btu/HCS11M-12HRFN1-MU5W, 22.5 SEER, 12k Btu/HCS11M-18HRFN1-MT0W, 20 SEER, 18k Btu/HCS11M-23HRFN1-MT0W, 20.5 SEER, 24k Btu/H
