product description : logitech pure-fi mobile connectivity : bluetooth 2.0 with enhanced data rate range : up to 30 feet frequency : 2.4ghz transmission format : digital voice input : discrete microphone array includes : logitech purefi mobile wireless speaker, ac power adapter (100v - 240v), user guide, travel case, usb cable * dual 2" active drivers and 1" pressure drivers * wireless freedom for your music with bluetooth 2.0 * integrated microphones and call/answer controls allow the logitech pure-fi mobile to act as a wireless speakerphone * 2" active & 2" passive drivers - advanced acoustics for impressive audio quality * make calls with your pc or listen to music from your pc all via usb * polycarbonate carrying case protects the logitech purefi mobile when you are travelling * the rechargeable batteries deliver over 12 hours of play time * included usb cable lets you listen to music, make calls, or charge the speaker while connected to your pc