Trendwoo Wireless Bluetooth Earbuds for Running Stereo Bluetooth Earphones Sweatproof Sport Earbuds for Excercising Bluetooth earphones: Latest Bluetooth 4.0 Technology,easy pairing with smartphones, tablets and other Bluetooth enabled music devices. Wileless Bluetooth earbuds: Noise Cancellation 6.0 Technology: with excellent sound effect collection, superior sound isolation, efficiently reduces external noises, and provides steady Bluetooth signal and support stereo APTX lossless music Sport earbuds: High-fidelity stereo music and clear speech, support A2DP technology, you can begin enjoying CD quality stereo sound instantly Built in rechargable lithium battery, about 6 hours talking,4 hours playing time,2 hours charging time, 200 hours standby when full charge, so you have less time charging and more time using Built-in microphone, controls for music,the volume, sound, song selection and telephone controls are all right on the wireless Bluetooth earbuds, making these the most convenient Bluetooth earbuds for running, sports, lifting weights & more!