> 160x320 graphic LCD with 16-level grayscales> LCD Backlight> Two page views are possible> Different icons for each function shown on the LCD > 20 physical keys each with a dual-color LED> Programmable for shared line, BLF List, call park,conference, forward, group pickup, group listening,LDAP, Pick UP, XML BrowserPhysical Feature:> Wall mountable> Stand with 2 adjustable angles> Expansion module (≤2) is powered by the host phone> Supports up to 6 modules daisy-chain> 2xRJ12（6P6C）ports for data in and out> Dimension (W*D*H*T): 127mm*213mm*167mm*45mm> Applies to Yealink IP Phone > Operating temperature: -10~50°C