BrandYealink ColourBlack Telephone typeCordless Number of batteries1 AAA batteries required. MaterialPlastic Power sourceCorded Electric T53/T53W/T54W/T57W firmware unified with dual firmware images Built-in dual band 2.4G/5G Wi-Fi (802.11a/b/g/n/ac) and Bluetooth 4.2 USB 2.0 port for USB recording, wired/wireless USB headsets and EXP50 Product specifications Product image gallery Yealink T54W Product Image 1