A Function: anIR camera was installed into the wallet, so that it can be put on the table and scan the cards, then the analyzer will givetell you the result through the earpieces. B Specification: 1.Scanning distance: 20-30cm 30-40cm 2.Estimate working hour: about 2.5hours C Configuration: It was included 1 LV wallet camera, 1 battery, 1 universal charger D Advantage: 1.Battery can be removable. 2.Double camera get bigger scanning area 3.Not easy to arouse others'suspect 4.Scanning cards speedily and stable transmitting 5.Single person operation and no need other partner.