ZyXEL Prestige 660R-D1 ADSL 2/2+ modem/router. DSL connection type: ADSL, Downstream data rate: 24 Mbit/s, DSL specification: G.992.1 Annex A. Operating temperature range (T-T): 0 - 40 °C, Operating relative humidity range: 20 - 85 %. Management platform: Web-based, Maximum data transfer rate: 0.1 Gbit/s, Dimensions (WxDxH): 105 x 106.5 x 35 mm