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. 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%. Package Features - Qty/CTN: 10 PCS. - N.W/CTN: 6.7 kg. - G.W/CTN: 7.6 kg. - Giftbox size: 237mm*154mm*100mm. - Carton Meas: 520mm*317mm*247mm.