This is the slender, lightweight dual-speaker system that rests around your neck and allows you to listen to music while you remain aware of your surroundings. It plugs into any portable audio device with a standard 3.5mm plug (compatible with iPhone and iPod Touch) with its 36" cord. Its dual 1" speakers offer a frequency range of 20Hz-20,000Hz for high-quality sound and are positioned to project sound up to your ears. With built-in volume control. The system only weighs 7 1/2 oz. and has two flexible sections on either side of the frame that enable you to adjust them for optimal comfort. Requires two AA batteries (provides 15-30 hours of listening). 1" H x 8 3/4" Diam. (7 1/4 oz.)