Aten 4-Port USB 2.0 HUB. Data transfer rate: 480 Mbit/s. Hub interfaces: USB 2.0. Output voltage: 5 V. Weight: 31 g. Operating temperature range (T-T): 0 - 50 °C, Storage temperature range (T-T): -20 - 60 °C, Operating relative humidity range: 0 - 80 %