The way this Callmate micro USB ShopReals OTG Smart works is very simple. Any portable device such as a mobile phone acts as a host allowing a keyboard, camera, printer or almost any portable device to attach itself to it and initiate communication. This cable is made from high-quality material and is extremely durable, thus you do not need to worry about a break in the cable. The best part about this device is that it is compact and takes up the least amount of space enabling you to fit it in a purse or bag. So now you can transfer your files on-the-go with the help of the Callmate Micro USB OTG Smart for tablets and mobiles.