The 4GB SDHC Memory Card Standard Series Class 4 from Samsung is a Secure Digital High Capacity card with a data storage capacity of 4GB. It has a Class 4 rating for minimum read and write speeds of 4MB/s, and is capable of up to 24MB/s reads. It is compatible with SDHC- and SDXC-enabled devices and readers. This durable card is waterproof, though not guaranteed submersible, as well as shockproof against small drops and magnet-resistant. It's also capable of withstanding extreme temperatures from -40 to 185°F.