USB OTG (On The Go) Xs-Drive Bridge 100 is a transfer device between digital camera, camcorder, memory card , USB key or MP3 player that makes transfer of data and backup in a one click button and without hassles. Xs-Drive Bridge 100 is a USB OTG bridge that copies and transfers data between two USB devices without a PC, and has added a few more buttons; a LCD menu; and the capability to selectively transfer files. This is a handy gadget if you need to transfer individual files from a flash drive to another; and from a digital camera to any USB hard drive. There is a sleek of applications for this device; when travelling with a digital camera, to move data between hard drives or transferring files to an MP3/Video device for playback, copy to and from USB Hard drives, Pen drives, Cameras, Recorders or Card readers. An optional AC adapter is supplied on request for rechargeable batteries, but the Xs-Drive Bridge can work without it thanks to alkaline removable A4 batteries.