G-Cord Bluetooth Headphones V4.0 Wireless Sport Sweatproof Headset Noise Cancelling In-Ear Earphones Stereo Clear Sound Earbuds Good noise isolation to create the optimal environment for listening to your favorite tunes, built-in microphone for clear calling and friends chatting Comfortable to wear, flexible and lightweight Simple-to-use: when the headset is off, press the Multifunctional Button for 5 Seconds, the Blue and Red indicator will flash quickly. The headset is ready to connect to your device Built-in rechargeable Lithium battery lasts up to 8 hours of calling6 hours music playing time and 160 hours standby, universally compatible with most Bluetooth-enabled phones Ideal wireless earbuds for the Gym, Hiking, Cycling, Jogging, Climbing without annoying cables, locks-in stabilizers offer secure fit for sports and fitness