Specification: USB 2.0 ports support USB devices such as USB flash disk, USB mouse, USB keyboard and etc. 2 USB 2.0 ports for charging. The micro USB port cannot be used for charging. It is used as power supply for USB 2.0 ports. Compatible with Macbook 12 inch, Chromebook Pixel 2015 and other device with USB 3.1 ports. Specifications: Types: Cable, Charger. Connector: Micro USB, USB 2.0, USB 3.1 Type-C. Material: Plastic. Color: Black. Package Weight: One Package Weight: 0.03kgs / 0.07lb. Package Content:One 1. Driver free This is Multi-function USB For Windows XP, Windows 7, 8 and Mac OS X 2. Two ports with USB sign: Support USB flash disk, card reader, mouse, USB hard disk 3. Note: The hard disk must have external power, the disk format must be FAT32, cannot read NTFS 4. Supports supply extra power through micro USB port if necessary.(Please take note:Extra power only charge for accessories such as mouse keyboard etc,can not charge for smartphone or tablet)