First of all, your phone must support OTG function to use this product 
<br />  Connect your USB On-the-Go capable tablet computer or Smartphone to USB 2.0 devices (thumb drives / USB mouse / keyboard... etc.) 
<br />Connect a thumb drive to your tablet or cell phone or eReader for removable data storage 
<br />Connect USB accessories to your OTG capable mobile devices & download pictures / transfer data & work more efficiently 
<br />USB OTG Adapter / USB OTG Cable 
<br />Comaptible with Samsung Galaxy S5 / Samsung Galaxy Note Pro / Samsung Galaxy Tab 3 / Asus Transformer Book T100 
<br />Support external USB mouse, keyboard