... we are able to develop new models and offer OEM service.For all usb flash drive, the guarantee is 1 year, please see detials ... ;2, Usage: PC, laptop or Mac with a USB interface, it's very hot to used with the mini speaker;3, Capacity:16mb ... , 32mb, 64mb, 128mb, 256mb, 512mb, 1gb,2gb,4gb, 8gb, 16gb, 32gb, 64gb ...