Features: 1. Unique, encrypted UID (unique identification)2. Each transponder contains 2,000 bits of memory 3. Available in various formats, allowing it to be programmed with both user and application-specific information4. Dimensions: a) 148 x 147 x 16mm b) 149.5 x 147.5 x 26.5mm c) 137 x 74 x 24mm d) 213 x 145 x 23mm5. Applications: identification and tracking of CDs and DVDs in libraries, and retail music or movie rental storesOuter packing: 250 or 350pcs/ctn producing area:China