Product Features: 1. Compatible with all tablets and phones with OTG functionality, including 2. Three USB expansion ports for connecting keyboards, mice, card readers, etc. (hard drives cannot be connected). 3. One USB power port; power is supplied by connecting the original charger. 4. Cable A end: Micro USB male connector for connecting smartphones or tablets. 5. Cable B end: Two USB 2.0 OTG ports for connecting external devices. 6. USB 2.0 ports support USB flash drives, card readers, USB mice, USB keyboards, USB game controllers, etc., and can operate simultaneously (hard drives cannot be connected). 7. Can connect up to 3 USB devices simultaneously. 8. Only supports FAT32 disk format for Android systems. 9. Supports USB 2.0, compatible with USB 1.1 10. Driver-free, plug and play, supports hot-swapping. Note: 1. Only compatible with devices whose micro-B USB port supports USB 2.0 host or USB OTG functionality. 2. OTG functionality does not support hard drives. Package Contents: 1 x OTG cable