Item Type: BT EarbudsMaterial: ABSColor: BlackEarbuds Battery Capacity: Built in 2 x 40mAh Lithium Battery (Included)Charging Case Battery Capacity: Built in 400mAh Lithium Battery (Included)BT Version: 5.3Transmission Distance: Approx. 10m/32.8ftPackage List2 x BT Earbuds1 x Charging Case1 x Data Cable1Long 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. 2Stable 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. 3Compatible 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. 4Waterproof: 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. 5Ergonomic 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.