Wholesale usb 3.0 micro B connector 21 pin cable charger for Samsung Galaxy Note 3 Tab, etc. This new micro usb 3.0 connector means faster charging and data transfer. First mobile phone to feature this connector is Samsung Galaxy Note 3. This micro b 3.0 connector is also used in some external hard drives. USB 3.0 micro B connector is also backwards compatible, which means you can still use your regular micro usb v8 cable to charge the device at the normal speed.