[4 pieces] 2 in 1 -USB OTG data cable connects USB keyboard and U disk, mobile hard disk must be connected to external USB power supply. At the same time, through the -USB OTG interface, mobile phones, tablets, MID, UMPC, OTG transmission of e-books. Supply power to USB peripherals. Make sure that your device's battery does not run out as quickly as other ordinary OTG data cables. Plug and play-no complicated installation required. Compatible with popular streaming media devices. Transfer photos, videos, documents, and other data between the device and external storage. (This OTG cable will not charge your phone or tablet, but you can power on the streaming stick) There is a separate -USB port on this adapter cable to connect the charger and -USB data cable to the USB device in use. Does not support powering mobile phones. Connector Type: -USB Applicable models: Devices that support -USB OTG size:About 20cm in length Material:Plastic + Metal colour:Black Package Contents: 4 x USB OTG cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. [4 pieces] 2 in 1 Micro-USB OTG data cable connects USB keyboard and U disk, mobile hard disk must be connected to external USB power supply. At the same time, through the Micro-USB OTG interface, mobile phones, tablets, MID, UMPC, OTG transmission of e-books. Supply power to USB peripherals. Make sure that your device's battery does not run out as quickly as other ordinary OTG data cables. Plug and play-no complicated installation required. Compatible with popular streaming media devices. Transfer photos, videos, documents, and other data between the device and external storage. (This OTG cable will not charge your phone or tablet, but you can power on the streaming stick) There is a separate Micro-USB port on this adapter cable to connect the charger and Micro-USB data cable to the USB device in use. Does not support powering mobile phones.