Features: Safe: Improved USB 2.0 HUB, soft arc edge design and reasonable interface spacing makes it more assured. 4 Ports: Extend four high speed USB 2.0 interface and it can connect four devices at the same time. Stable: Chose FE1.1S chip so it has a mature and stable working capacity, compatible with excellent extension strength. Good Quality: Insulation ABS protective shell, durable wear, have good working performance, simple and fashion. Plug and Play: Nearly USB 2.0 480Mbps speed, due to the low power chip and circuit design optimization, plug and play. Note: The transmission rate is rational value which is related to the U disk.