Yealink YEA-EXP38 Yealink IP Phone Expansion Module - NEW - Retail - YEA-EXP38 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, etc