Description: This is a real USB connector, and it is also a USB connector camera, as for this USB, it is a connector which can connect the wires to charge the mobile power or mobile phone. It is a good camera to scan barcodes marking playing cards for poker analyzer. When you use USB connector camera, you should connect it with your mobile phone and your mobile power, and then put them on the table to scan the marked cards, and then the poker analyzer will tell you the results. Distance:From 25-35 cm Estimate working hours: as long as your mobile power.