The Monster Bluetooth headphone is designed and engineered by Noel Lee and the Monster Design Team in the USA with quality components that deliver best in class performance with zero distortion at any volume. With the Qualcomm chip and apt-X high-tech which design to enhance and reproduce perfect 3D stereo audio quality. Promising a free lossless audio with no distortion. 【One Step Pairing】they will connect with each other automatically. You can use the earphones in binaural mode (two earphones) or in single mode. 【Crystal-Clear Calls 】cVc 8.0 noise cancellation technology effectively blocks out background noise & accurately picks up your voice, so you’re heard clearly on the other end without interference even in a noisy environment. 【Up to 100 Hours of Playtime) stream music for up to 6 hours on a single full charge and pocket sized charging case with built-in 2600mAh battery provides 17 times full charge for the earbuds extends playtime up to 100 hours. Type-C Quick Charge technology supports 1 hours of playtime after 5 minutes quick charge. 【IPX8 Waterproof】The Bluetooth earbuds are resistant to sweat, water and rain. Ergonomically in-ear design,Perfect for sports, running, gym, relaxation, etc