Feature: 1. Long Battery Life: Equipped with 400mAh rechargeable charging case, the wireless earbuds can be charged automatically after putting them into the charging case, and can be used for 3 to 4 hours on a single charge. 2. Stable Connection: Bluetooth earbuds provide fast, stable and efficient transmission, remove the left and right earbuds from the charging case, connect and use. No need to worry about sound loss. 3. Compatible Devices: Bluetooth earphones can be used to connect to laptops, for iPhone, for Android, and can wake up sound assistants. Provides stereo sound for calls. 4. Waterproof: These wireless earphones are protected from sweat or rain damage (the charging case is not waterproof). Won't get in the way of enjoying sports, music and calls. Great for fitness trips and more. 5. Ergonomic Design: Our Bluetooth headphones are ergonomically designed to fit comfortably into your ears and you can focus on your workout, and are also great for daily, driving, and cycling use. Specification: Item Type: BT Earbuds Material: ABS Color: Black Earbuds Battery Capacity: Built in 2 x 40mAh Lithium Battery (Included) Charging Case Battery Capacity: Built in 400mAh Lithium Battery (Included) BT Version: 5.3 Transmission Distance: Approx. 10m/32.8ft. Package List: 2 x BT Earbuds1 x Charging Case1 x Data Cable