Yealink EXP50 4.3″ Color Expansion Module – 20 Keys + Dual‑LED, Up to to 3 Modules Daisy-chain

Yealink EXP50 – Specifications

Display & Interface

• 4.3‑inch color LCD

• Resolution: 272 × 480 pixels, 16‑bit color depth, backlit

• Stand with 2 adjustable angles

Keys & Buttons

• 20 physical programmable keys with dual‑color LEDs (one per key)

• 3 control keys with illuminated LEDs for page switching

• Supports 3 pages → up to 60 programmable keys per module

Functionality / Programmable Features

Keys can be assigned to typical PBX/VoIP controls:

• Busy Lamp Field (BLF) / Bridged Line Appearance (BLA) / shared‑line monitoring

• Speed‑dial / Hotline / Direct call / extension call

• Call transfer, call forward, call park / pick-up, call hold

• Conference, voicemail/message‑waiting indicator, Do Not Disturb (DND)

• Call pickup / group pickup / group listening, intercom, shared‑line, directory access (when phone/PBX supports)

Connectivity & Expandability

• Interface: USB 2.0 to host IP phone (for data + signalling)

• Daisy‑chain support: up to 3 EXP50 modules per phone — total up to 180 extra programmable keys

• For configurations with 2 or 3 modules, external power supply (5 V / 2 A) may be required

Additional Features & Use Cases

• Ideal for receptionists, contact centers, administrative desks — where many lines/extensions need monitoring and quick access

• Expands compatible Yealink T5‑series IP phones into multi‑line consoles

• Improves efficiency for call‑heavy environments