Zoom 3048. Modem speed: 56 Kbit/s. Supported data transfer rates: 56 / 48 / 33.6 kbps, Maximum fax transfer rate: 14.4Kbps. Dimensions (WxDxH): 133 x 38 x 165 mm. Certification: FCC Parts 15B & 68 UL, C-UL Industry Canada CE