Designed for the new range of Apple products, the JBL ONBEATMICRO combines brilliant performance with portability. Its excellent portability is achieved with battery power, giving you up to 5 hours of music on standard set of 4 AAA batteries or as long as you want on AC power. & if you dont use an iPod, you can connect a personal MP3 player or smartphone to the On Beat Micro & enjoy your favourite music that way. An automatic power saving mode works after 10 minutes of idleness to both save energy & ensuring its ready to go straight away.