Two official Wi-Fi adapters are available for the Xbox 360, both of which connect through a USB port. The first version released supports 802.11a, 802.11b and 802.11g connections, features a single antenna and is only available in white. On October 5, 2009 Gamestop revealed a new version of the wireless networking adapter which features support for 802.11n networks in addition to those supported by its predecessor. This version features two antennas to ensure adequate 802.11n connectivity, and is only available in black. Encryption mechanisms available when using both versions were initially limited to WEP and WPA, with WPA2 support added on October 28, 2009 via a system software update.