STRONG COMPATIBILITY: Herfair 4 port usb hub supports Windows (Win 11 not supported), Mac OS, Linux, Chrome OS all major systems, applies to various devices: laptop, PC, MacBook, Xbox, PS4, flash drive, keyboard, mouse, card reader, hard disk, printer, camera, USB fan/cable, all usb peripherals. | POWERFUL PERFORMANCE: All Herfair usb port expander for laptop are tested one by one before shipping to ensure its quality, all four usb ports can work simultaneously without any pressure and the heat keeps within moderate range, built-in chip provides its stable performance. | ULTRA SLIM & PORTABLE: Herfair usb adapter for laptop is the most slim usb hub on the whole market (even thinner than your phone), but still we have enough spaces to plug 4 flash drives at the same time because most sizes of the usb peripherals and the space between USB ports have been considered. | USB PORT EXTENSION: All four ports of this usb splitter for laptop are standard USB 2.0 which provides 5-10MB/s writing speed and 15-30 reading speed, faster to help you sync files between devices. Blue indicator light can show directly the working status of this laptop usb port expander. | EXCELLENT WARRANTY: Even though we Herfair tested every port of this multiple port usb hub before shipping, but due to long time transportation or other reasons, so if the usb port expander you received has any problem (like ports not working), please contact us via Message for re-fu-nd or re-pla-ce-ment immediately! Two year warranty supported!