Built-in rechargeable battery, come with a charging cable. Noise cancellation design, perfect sound quality, Sweat Proof.Application & Removal of all the items are hassle-free and easy to complete. Rest assured your AirPods and case will be safe. Simple one-button design Best for Hands free & Music while driving/walking/Gyming/Running/Work Out/Sports and Other Outdoor Activity. Easy to use and fast pairing with your Bluetooth devices. i7S TWS Twins Earphone with small size, super light weight. Ensure a secure and comfortable fit for any ear. True high definition sound Equip with Bluetooth 4.2 and CVC 6.0 Noise Cancelling technology to enjoy clear fidelity phone sound.Quiet surroundings offer better sound.Sweat proof protection compatible with this device.