Clear your workout with Pebble Sports wireless headphone. Designed for comfort along with performance during rough workout. It comes with easy to wear In-Ear neck hooks design to ensure perfect fit. Comes with superior quality sound drivers and Bluetooth 4. Pure Sound Bluetooth 4.0 Perfect Fit Light & Portable Inbuilt Microphones Noise Cancellation Battery Voltage : 55mAh Sensitivity: 102 - 3 dB.mW Impedance: 32 ohm Driver diameter: 10 MM Bluetooth Version: V4.0 FREQCHP Working Range: Upto 10m Working Time: 3 Hours Frequency Response: 20Hz-22000hz