Moki BASSBURGER is a powerful palm size boom-box that creates sound way beyond its tiny size, producing bass like no other portable speaker. It delivers a rich, dynamic sound that must be heard to be believed. Constructed from tough, durable soft-touch material & at only 1/5-Inch (5cm) in diameter it"s made to go wherever you do. Small enough to clip on your bag, keys or carry in your pocket. Moki BASSBURGER is a licensed product that using a patented vacuum bass design to increase its internal resonance achieved by a simple twist to expand. It has an in-built rechargeable lithium battery that can keep the music playing for over 8 hours depending how loud you play & it won"t drain the power from your player and it can be recharged up to 500 times via USB. Beware of unlicensed imitators with much reduced quality in both sound and construction. Moki BASSBURGER is the ultimate balance between portability and great quality sound. Connect your BASSBURGER to any audio device with a standard 1/8-Inch (3.5mm) headphone socket - iPods, MP3 and media players, handheld game consoles, laptops, mobile phones and more.