Features* Lightsome Style - Bluedio M2 is designed to be light and stylish at the same time， keeping maximum comfort while looking good.* T-Light in-ear Design - Earpiece design (S M L) is made to distribute weight evenly while keeping the earpiece stable.* Crystal Clear Sound - Crafted with built-in 10mm dynamic driver and CCAW voice coil， creating a surprisingly high quality sound.* Wind Noise Reduction - With the technology available， the M2 can actively tone out wind noise， improving call quality and clarity.* Sweat-Proof - Sweat and Rain will not be able to interupt headset operations.Multipoint Pairing - Connect up to 2 Mobile Devices simultaneously.* EQ Adjusment - By pressing the Vol(-) and Vol(+) simultaneously， EQ mode will be available for customizing.Specification* Bluetooth Versions: Bluetooth V4.1* Frequency Range: 2.4GHz-2.48GHz* Operating Distance: Up to 10m (Free Space)* Bluetooth Profiles: A2DP， AVRCP， HSP， HFP* Frequency Response: 20Hz-20kHz* Talk/Music Time: About 7 Hours* Standby Time: Up to 160 Hours* Operational Temperature: -10 to 50°CPackage Include:1 x M2 HD Stereo Headphone 1 x USB Charging Cable1 x Instruction Manual