Sound currency detectors: AAA , 2 pcs Power Sound sensitivities To detect multi currencies 980nm invisible light ... ,the product can detect item with infrared Anti-counterfeit material. 2,Application methoTo aim the detector head at the item, to ... through and detet. 3,SpecificationSize:20 X 4.5 X 2 cm, Weight 30 gram,DC3V,AA battery,Looks like TV ...