Aastra M675I (A1760-0000-1055) Expansion Module Type: Expansion Module Display: Scalable to 3 expansion modules per phone Power direct from phone Programmable features: Line, speed-dial, BLF, BLA, SCA, DND 60-keys with LED (3 pages of 20) Self-labeling LCD backlit display Supported on 57i, 57i CT (phone sold separately) Weight: 1.4 Specifications: Programmable Keys: 28 per page Pages: 3, for 84 keys total LED Indicators: yes Busy Lamp Fields: supported Speed Dialing: supported Stackable: up to 3 modules (252 keys total) Power: via phone