The ACOUZTIC features a multi-functional Hi-Fi MP3 player with great audio quality, combined with an ultra-bright tactical LED flashlight, all in a compact, easy-to-carry unit. Durable, waterproof aluminum housing. The highly engineered patented, built-in vacuum enclosure design allows for stunning crystal clear sound with powerful bass. 2 GB memory (400-500 songs). 5 lighting modes (high, med, flash, strobe, SOS). USB rechargeable. Safer than wearing headphones when cycling. Includes wall charger, USB cable, lanyard, and handlebar mount. Dims: 1.5" D x 5.43" Wt: 8.5 oz (241 g).