Feature: * USB Rechargeable - Mobile Charging.Use anytime,anywhere * Smart Noise Reduction - It can greatly reduce noise, providing high clear sound quality. * 12 Channels-It can make you hear better and clearer. * Support to connect phone bluetooth, and support phone calls and music. * 4 Volume Levels to short press the touch button adjust the volume to meet your needs. * You just need to charging for 1.5-2 hours, then you can use for 8 hours. *Touch Button 1 sec answer the call; 2 sec hang up the call; 2 sec reject the phone. * Non-inductive design comfortable to wear. Technical Specification: 1. Output. OSPL90 Max. 105dB 2. FOG50 MAX Gain 33dB 3. EQ Input Noise 22dB 4. FREQUENCY RANGE(Not narrower than): 200Hz-4500Hz 5. Working Current 8mA/ 6. Total Harmonic Distortion