This case goes wherever you go. No Need to plug it in or recharge. Its advanced design gives its four AAA batteries unprecedented life up to 30 hours. Don’t be fooled by the size. Thanks to the state-of-the-art electronics and speakers, you hear rich full sound you’d expect from systems many times its size. The system is tough. Safely inside, your iPod is protected from bumps and other rough handling by the sturdy construction.