The Duracell ' On the Go' USB (Universal Serial Bus) flash memory is incredibly small & perfect for everyday use. At just 3cm X 2cm & only 20grams it provides convienent storage without being bulky. The 4gb storage capacity can hold upto 1000 8 Megapixel Photos or 1000 4min MP3 Music Tracks. Trusted Quality. 5 Year Warranty. 4gb Storage capacity.