iMainGo2 goes wherever you do. No need to plug it in or recharge. Its advanced design gives it four AAA Batteries (included) unprecedented life, up to 30 hours. Don't be fooled by the size. Thanks to iMainGo2's state-of-the-art electronics and new titanium speakers, you hear rich full Sound you'd expect from systems many times its size. iMainGo2 is tough. Safely inside, your iPod is protected from bumps and other rough handling by iMainGo2's sturdy construction. To use your iMainGo2, just unzip it, plug in your iPod (any iPod fits), iPhone or MP3, zip it up and stand back! Control your device through the iMainGo2's touch sensitive window. -Features: -Custom fits and protects all iPods (except Shuffle), iPhone, iPod touch, and Zune -Play, control, and view your MP3 player without opening your iMainGo2 -State-of-the-art electronics deliver bigger and better sound than systems many times the price and size -Premium titanium high Output Stereo speakers -Tuned porting for amazing Bass reproduction -Ultra-efficient Digital Music amplifier -Battery life up to 30 hours -Can be used as a premium external stereo speaker system for most MP3s, cell phones, laptops, portable gaming systems, electric guitars, etc -Includes 4 AAA Energizer alkaline batteries and removable carry strap -Wake up to music with built-in alarm feature (on alarm-equipped iPods only) -Manufacturer's 1-year limited Warranty