... 2.ISO9001:2000 3.specifically used for jewelry 4.RF,AM are availabe specification: Frequency 58KHz/8.2MHz Dimension 21x55X9mm Color ... helps you lock and release by one step.6.RF,AM are availabel7.more than 10 years autonomous R&D and ... , jewelry hard tag ,rf jewelry tag,am jewelry tag, eas rf jjewelry tag,eas am jewelry tag RF AM jewelry hard tag T183