Bluetooth 5.0 technology that provides in-call stereo sound and fast and stable transmission without tangling. We can accept OEM service,you can logo your brand on products or package When you are in a rush and need power fast simply charge for 10 minutes and get up to 1 hour of playtime. The advanced Bluetooth 5.0 technology delivers high-quality sound, lets you pair the earbuds faster, and ensures a stable connection. These earbuds are built to use either one or both as you like for wireless music or hands free calls..syi