Kingston's SDHC Ultimate is the manufacturer's mid-range line of high-capacity SD cards, available in 8GB, 16GB and 32GB versions. SDHC cards feature greater storage capacity than regular SD cards – limited to 2GB capacities in Kingston's offerings – and are intended to hold hours of HD video or thousands of photographs. The Ultimate cards are rated "Class 6", meaning they guarantee a minimum data transfer speed of 6MB/s, placing them in between the Class 4 and Class 10 cards in Kingston's SDHC lineup. The cards are designed to be durable and reliable, with no moving parts. SDHC cards require devices supporting the format, and will not work with those supporting only SD.