VoIP 560M / M675i Expansion Module for 6755i, 6757i, 6757i CT, 6739i - 60 keys with LEDs (3 pages of 20) - Self-labelling LCD backlit display - Maximum 3 modules per phone. Note: When used with 6739i, external AC adapter is required to power the phone combined with the expansion module, as PoE is not sufficient.

Up to 9 call appearance lines over the phone and expansion modules Shared Call and Bridged Line Appearances (SCA & BLA) Busy Lamp Field (BLF) Programmable Speed dials Custom XML feature key support Call park and pickup Directory Callers log Do Not Disturb Flash features