• Wallpaper, screensaver, power saving • Stand with 2 adjustable angles • For support of two or three Expansion Modules, an external Yealink power adapter (5V/2A) is required. • Up to three EXP50 can be attached on Yealink T53/T53W/T54W/T57W/T58A/T58W IP phones • USB port (2.0 compliant) for data in and out • USB port (2.0 compliant) for: wired/wireless USB headset Wi-Fi through WF40/WF50 for T53 USB call recording through USB flash drive • Max power consumption (PSU): 1.5W • Dimension (W*D*H*T): 196.5mm*124.0mm*137.5mm*42.6mm • Applies to Yealink T53/T53W/T54W/T57W/T58A/T58W • Operating temperature: -10 to +45°C (+14 to 113°F) • Storage temperature: -30 to +70°C (-22 to +158°F) • Operating humidity: 10-95% | 
