US Robotics 56K V.92. Modem speed: 56 Kbit/s. Operating temperature range (T-T): 0 - 50 °C, Operating relative humidity range: 20 - 80 %, Storage temperature range (T-T): -20 - 70 °C. Package weight: 0.2 kg. Certification: CE Class B FCC Part 15 Class B/Part 68 IC UL CUL