The EXP40 Expansion Module for the SIP-T46G and SIP-T48G, expanding the functional capability of your sip phone to a whole new level. It features a large graphic LCD. Two pages of 20 flexible buttons are shown on the display can be programmed up to 40 various features, the productivity-enhancing features include BLF/BLA, speed dialing, call forward, transfer, park, pickup, etc. Features > An exclusive collection which quality and detailed designs > Rich visual experience with 160x320 graphic LCD > 20 physical keys each with a dual-color LED > 2 independent control keys are used for fast switch pages > Stand with 2 adjustable angles > Wall mountable Specification Display > 160x320 graphic LCD with 16-level grayscales > LCD Backlight > Two page views are possible > Different icons for each function shown on the LCD Features Keys and Indicator > 20 physical keys each with a dual-color LED > 20 additional keys through page switch > 2 independent control keys are used for fast switch pages > Programmable for Shared Line, BLF List, BroadSoft Group, Call Park, Conference, Forward, Group pickup Group listening, LDAP, Pick UP, XML Browser, Zero-SP-Touch...... Physical 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 > Operating humidity: 10-95%