SanDisk 4 GB Class 4 SD Flash Memory Card - 2 Pack of SDSDB-004G (SDSDB2L-004G) with Jewel Case in Environmentally Friendly Packing (Label May Change) Class-4 speed performance for recording up to 720p HD1 video clips Waterproof, temperature proof, shock proof, vibration proof, and x-ray proof2 Solid-state memory with no moving parts for proven reliability Easy labeling for multiple storage uses  photos, music and videos Built-in write-protect switch prevents accidental data loss