Can be used with a variety of digital music players, cell phones, digital cameras, camcorders. Can read, write and erase. Write speed 10MB per second. Read speed 15MB per second. Optimised for high speed. User selectable mechanical write protect switch. Compatible with all SDHC compliant host devices. Not backwards compatible with legacy SD format host devices. Stores approximately 1,116 images in standard resolution with a 5 mega pixel camera. Manufacturer's 10 year guarantee.