Apotop Wi Copy - Personal Cloud Storage and Wireless Router for Tablets (DW21) Use your Smart Phone or Tablet to wirelessly transfer data between an SD Card or a Flash Drive Mobile Wireless Personal Cloud Storage and Wireless Router. Easy to use Wireless/Wired Card Reader, Supports SD or USB drive for wireless file sharing or Backup External Hard Drive Support (USB 2.0 Hard Drive). Data transfer is now 3x faster compared to earlier versions of the Wi Reader Products. Up to 14 hrs. battery life. Built-in rechargeable battery 5200mAh, no any external power supply needed. USB cable included. Supports fast charging with 2A outputs. Compact design, makes it ideal for use during travel. Can be used as a wireless router.