Tiptel 293 ISDN CTI Mailbox. Phonebook capacity: 1000 entries. Weight: 0.9 kg, Dimensions (WxDxH): 220 x 200 x 90 mm. Compatible operating systems: Windows 95/98/ME/NT 4.0/XP/Vista. Operating temperature range (T-T): 0 - 40 °C. Certification: EN 55022, EN 60950 / A3, EN 50082 part 1 TBR8, CTR3