Naztech N20-11912 Portable Speaker for iPhone 4S/BlackBerry/HTC/Samsung/Motorola - Retail Packaging - Black 2 High Efficiency Speakers, Foldable for Easy Portability, Battery or AC Powered, Ideal for all 3.5mm devices, Acoustically Optimized Design, Up to 15 hrs Play Time, Hi-Fi Stereo Specifications: Input Voltage: 6V DC, Output Power: 2 x 1W, Impedance: 4, Frequency Response: 200Hz~12KHz Power Source: 5V DC USB Cable (included) or 4 AAA batteries (not included) or AC adaptor (not included) Compatible with: Apple iPad, Apple iPad 2, Apple The New iPad, Apple iPhone, Apple iPhone 3G, Apple iPhone 3Gs, Apple iPhone 4, Apple iPhone 4 CDMA, Apple iPhone 4S Also Compatible with most Cell Phones: BlackBerry by RIM, Casio, HTC, Motorola, Samsung, Nokia