4 Ports USB 2.0 hubs with USB power adapter. Charge and connect any USB device. Powered by computer USB port or USB ... High quality, fashionable design, legerity convenient to carry, USB 2.0 version specification, high speed transmission may up to 480Mbps, ... efficiency, supports hot plug, low electricity consumption, built-in over-current protection circuit, uses the most advanced PolySwitch protection, ...