Use the ergonomically designed with gel-flexible silicone earcaps to ensure your In-Ear Headphones fit comfortably to the ears. The Most Advanced Bluetooth 5.0 Technology Support HSP, HFP, A2DP, AVRCP. Provides in-call stereo sound. Also own fast and stable transmission without tangling. Hi-FI Stereo Sound Quality Offers a Truly Natural, Authentic Sound and Powerful Bass PerformanceThe Waterproof Function of Earbuds and Charging Case both Reach IPX8 IPX8 Waterproof Nano-coating efficiently protects the earbuds and charging case from sweat or water, perfect for running,skiing, etc. (not for swimming) One Step Pairing Pick up 2 Headsets from Charging Box They will Connect Each Other Automatically, then Only one step easily enter mobile phone bluetooth setting choose "TOZO-T6" to pair the earbuds. Note: If you accidentally get only one earbud paired with phone, please try "Reset" options. (Pls refer "Reset" details in manual) Charging Case Supports Wireless Charging The case which is compatible with wireless charger (Not included) offers you a more convenient charging method and get you rid of wire.