- 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