- 38 programmable keys each with a dual-color LED- Daisy-chain 6 modules for 228 programmable keys- Dual color red or green LEDs for line status information- Supports Busy Lamp Field BLF Bridge Line Appearance BLA - Programmable for speed dialing call pickup Intercom hold transfer voicemail forward DND - Applies to Yealink IP Phone SIP-T28P and SIP-T26P- Expansion module 2 is powered by the host phone
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