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Technical data of COMfortel 2500:
| Operating voltage | via internal S0 or UP0 port of the PBX; with connected COMfortel Xtension30 module(s) the external power supply COMfortel XT-PS is required |
| Power consumption | 0.6 W min., 2 W max. (without kex extensions module COMfortel Xtension30) |
| System connection | internal S0 or UP0 port of the PBX |
| Module connection | proprietary system bus for COMfortel Xtension30 |
| PC connection | USB port |
| Headset connection | for dyn. speaker/microphone sets, also with DHSG support |
| SD card slot | for SD memory card up to 2 GByte |
| Displays | LCD with 128 x 64 pixels, 18 LEDs, some multi-coloured |
| Keys | Keypad with vanity code, 11 function keys, 8 softkeys, 15 programmable function keys (2 levels) |
| External memory | SD/SDHC card, 4 Gbyte max. |
| Handset | Electret mikrophone, dynamic ear speaker, hearing aid compatible |
| Speaker | 8 Ohm, Ø 66 mm |
| Hook switch | magnetic switch |
| Case | plastic |
| Colours | black, dark blue, light grey (white) |
| Dimensions (w x d x h) | 261 mm x 216 mm x 109 mm |
| Weight | approx. 1000 g |
| Safety, approvals | CE |