Cisco Versatile Interface Processor 4, Model 50. Weight: 2.25 kg. Operating temperature range (T-T): 0 - 40 °C, Storage temperature range (T-T): -20 - 65 °C, Operating relative humidity range: 10 - 90 %. Safety: UL 950, IEC 950, EN60950, CSA C22.2 No. 950-M29, Certification: FCC Class A, CISPR-22 Class B, EN55022A Class B, VCCI Class 2; IEC 801-2, 3, 4, 5, 6, 11. Compatible operating systems: Cisco IOS. Internal memory: 64 MB