Ingenico IWL220 Technical Manual page 56

W
Wifi : Wireless fidelity, Wireless network.
Wifi 802.11 a : wifi on 5GHz band
Wifi 802.11 b : wifi on 2.4GHz band / 11Mb/s max
Wifi 802.11g : wifi on 2.4GHz band / 54Mb/s max
Wifi 802.11n : wifi up to 130Mb/s (in SISO mode) on 2.4GHz or on 5Ghz
Wifi SISO mode : single in, single out mode. Meaning 1 antenna only.
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