EarlyBirdSavings 4 Ports ON/OFF Switch Extension USB2.0 Hi-Speed Multi HUB Black For PC Mac Fully compliant with USB specification version 2.0 Compatible with Windows 2000/ME/XP/7, Mac OS 9.0/Linux or later No Power adapter required, usb bus powered. Hot-swappable Plug & Play connection Generous Slim Design, convenient Size: 8.4cm x 3.2cm x 1.5cm. Colour: Black. Weight: 30g