CaseBuy 5pcs 1GB Flash Drive - Bulk Pack - USB 2.0 Snapcap Design & 5pcs Red Lanyards (1GB,Red) Quantity:5pieces (Every PCS test before shipping) + 5pcs black lanyards(7 inch(in full)). Chip: Grade A, High Quality. Capacity:1GB Operating System : Windows 7/Vista/XP/2000/ME/NT/98,Linux and Mac OS 100% MANUFACTURER'S WARRANTY: if you are not happy with any product for any reason by CaseBuy, please do not hesitate to contact us. In every customer relationship, CaseBuy strives to be a trusted partner and seek to achieve 100% in customer satisfaction.