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. Brand formerly known as Aastra.