Main features:

Compatible with PL350 and PL340
 30 DSS buttons with dual color (LED-Green and Red) for line status information
 Up to 29 programmable functions
 Daisy-chain 5 modules for 150 programmable keys
 Supports Busy Lamp Field (BLF), Presence
 Programmable for speed dialing, call pickup, Intercom, hold, transfer, voice mail etc.
 Expansion module is powered by the host phone

Specification:
 Compatible with PL350 and PL340
 30 DSS buttons with dual color (LED-Green and Red) for line status information
 Up to 29 programmable functions
 Daisy-chain 5 modules for 150 programmable keys
 Supports Busy Lamp Field (BLF), Presence
 Programmable for speed dialing, call pickup, Intercom, hold, transfer, voice mail etc.
 Expansion module is powered by the host phone