Devolo MicroLink 56k. Modem speed: 56 Kbit/s, Interface: USB. Upstream data rate: 0.056 Mbit/s, Downstream data rate: 0.0336 Mbit/s, Maximum fax transfer rate: 14.4 Kbit/s. Operating temperature range (T-T): 5 - 40 °C, Operating relative humidity range: 0 - 80 %. Weight: 140 g. Package dimensions (WxDxH): 234 x 71 x 188 mm, Package weight: 510 g