The Yealink EXP39 LCD Expansion Module has been designed to improve the power & flexibility of the advanced Yealink IP phones. It features a 160x 320 graphic LCD & 20 physical keys, each with a dual-color LED. These show very clearly which function had been selected & make operation very easy. What is more, you can add 20 additional keys via a page switch, bringing the number of programmable keys up to 40. Each programmable key supports functions that include speed dialing, plus BLF/BLA, intercom, call forward/transfer/hold/park/pickup/return. This allows up to six EXP39 units to be daisy-chained together. The Yealink EXP39 is ideal for receptionists, administrative assistants, call center agents, power-users, & executives who need to monitor & manage a large volume of calls on a regular basis. Features include: * A rich visual experience with a 160x 320 graphic LCD * 20 physical keys, each with a dual-color LED * 20 additional keys through page switching * A daisy-chain of up to six modules providing up to 120 keys * Support for BLF/BLA, speed dialing & call pick-ups