contact info. vanessa We are profeesiaonl supplier and manufacture of optical USB products Features: Capacity: 128MB/256MB/512MB/1GB USB 1.1 interface Software upgraded flash chip Promotion preponderance Shock-proof and moisture-proof, plastic shell Write protection switch High speed to read at 1.6MB/s, write at 1.2MB/s Hot plug and play Operating system: Windows98/NT/ME/2000/XP or higher (driverless above Win98) Unit size:60*16*16mm, weight:15g Packing Detail: Inner packing size:13.3*13.3*3.3mm, weight:0.13kg Meas.:59*30*55cm, QTY./ctn.:136pc