11N is the highest for now.
802.11b,
Features: 2.4GHz frequency band (the same frequency band as cordless phones, Bluetooth, and microwave ovens, causing interference),
Transmission distance : 300 meters outdoors, 100 meters indoors, high power consumption, maximum transmission speed 11Mb/s, actual speed about 5Mbps.
802.11g,
Features: 2.4GHz frequency band, backward compatible with 802.11b standard, transmission speed 54Mbps, transmission distance 100 meters. 802.11n, features: the latest protocol, not fully backward compatible, transmission rate 108Mbps-600Mbps, transmission distance 200 meters.
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