Funkwerk Elmeg CS410-U. Phonebook capacity: 250 entries. Networking standards: ISDN. Weight: 800 g, Dimensions (WxDxH): 180 x 100 x 255 mm. Compatible operating systems: Windows 98SE / ME / 2000 / XP. Operating temperature range (T-T): 5 - 40 °C, Storage temperature range (T-T): -25 - 70 °C