Main Features

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

Physical Features

2xRJ12 (6P6C) ports for data in and out

Power adapter: AC 100~240V input and DC 5V/1.2A output

Weight: 255g

Dimensions: 132x143x42mm

Operating humidity: 10~95%

Storage temperature: max 60°C