Excellent Audio: apt-X HD audio combines with 10mm drivers deliver clear and smooth sound; By having high resolution audio technology, Boltune wireless headphones is with exceptional clarity & high fidelity, transmit Hi-Res Audio files, makes it possible to hear every small details in the music. | Crisp Voice Calls: Built-in microphone with advanced cVc 8.0 noise cancellation technology effectively blocks out noise, allowing you to take clear hands free calls on the go. Even in unpleasant noisy environments, you can enjoy a very clear call. | 3 Equalizer Modes: Adjust the intensity of your music with Bass, Normal and Treble modes to optimize your soundtracks, audio books, and more. A simple push of "Play ""+ "simultaneously activates the EQ settings feature getting your music more rhythmic and richer. | IPX7 Sweat and Waterproof: Fully waterproof build delivers serious defense against rain, sweat, and more; listen to music whilst running, hiking, and doing other exercises, protects the headphones from heavy rains or sweat fitness even in rainy days.(not recommend for swimming) | 16 Hours Playtime and Quick Charge: Bluetooth 5.0 technology combines with high-performing rechargeable batteries for up to an incredible 16 hours playback on a full charge. 5 minutes charge for using 2 hours! 12-month warranty promise and within 24 hours considerate after-service , no matter product problem, we will replace new one or refund for you.