PNY Optima 4GB Class 4 SDHC Memory Card PNY Optima 4 GB Class 4 SDHC Memory Card General Features: 4 GB capacity SDHC form factor (not backwards compatible with SD) Class 4 speed rating (4 MB/s) Write protection switch Record videos and images, download music and store images Ideal for digital cameras, camcorders, MP3 players, PDAs and other SDHC-enabled devices Regulatory Approvals: