Just browsing the web and came across this, looking for one to use in my psp (with adaptor) thought it seemed like a good price for a class 4.
Starting at 4GB, microSDHC cards offer higher storage for more music, more videos, more pictures, more games more of everything you need in todays mobile world. The microSDHC card allows you to maximize todays revolutionary mobile devices. Dane-Elecs microSDHC cards use the new speed class rating of Class 4 that guarantee a minimum data transfer rate of 4MB/sec. for optimum performance with devices that use microSDHC.
Identical in physical size to todays standard microSD card, the microSDHC cards are designed to comply with SD Specification Version 2.00 and are only recognized by microSDHC host devices. They can be used as full-size SDHC cards when used with the included adapter. To ensure compatibility, look for the microSDHC or SDHC logo on host devices (e.g. phones, PDAs, and cameras).
Wherever you find yourself in the mobile world, you can trust and rely on Dane-Elecs microSDHC cards.
Compliant with the SD Specification Version 2.00
Versatile when combined with the adapter, can be used as a full-size SDHC card
Compatible with microSDHC host devices; not compatible with standard microSD-enabled device/readers
File Format FAT 32
Dimensions: 11mm x 15mm x 1mm
High-Speed Class Rating Class 4: 4MB/sec. minimum data transfer rate
Operating temperatures: -13°F to 185°F (-25°C to 85°C)
Storage temperatures: -40°F to 185°F (-40°C to 85°C)
Weight: .05 oz (1.4g)