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14 programmable function keys per Expansion Module
Expandable with maximum 3 modules for up to 42 function keys
Each key can be programmed as Line, Speed Dial, Park + Orbit, Call Divert, Busy Lamp Field
Basic expansion module in silver black
The expansion module ZY900 PRO makes your phone more advanced, with 14 programmable function keys at your fingertips. If you still require more, you can add up to three modules for a maximum of 42 function keys. Each key lets you choose from several options.This expansion module is also available in black (ZY700 Pro).