The August EP630 are small and powerful high quality headphones that connect easily to any Bluetooth enabled device - Cell Phones, MP3 players, Laptops, Smartphones... - giving you a hands free head set as well as track and volume control! The August EP630 delivers superb sound performance and is easy to control. A wireless connection is established in seconds with no need to install any software or drivers. No more tangled cables! The integrated battery provides up to 11 hours working time. So whenever you are on the go - the August EP630 will provide hours of enjoyment. Also ideal for internet calling (VOiP) services such as Skype and Yahoo. Specifications Speakers: 3 Ohm, 25mW Frequency: 20Hz-20KHz Sensitivity: 115dB±3dB SNR: ≥85dB Distortion: ≤0.5% Power Input: DC 5V 500mA Battery: Internal Li-ion / 3.7V / 240mAh Charging Time: 2.5 hours Working Time: 8 hours Bluetooth Version: Bluetooth 2.1 Range: up to 10m (Class II) Dimensions: 6.8x6.1x2.2inches Weight: 3.6oz