The iPhone 7 / 7 Plus / 8 / 8 plus / X headphone is a Bluetooth connectivity version What should you pay attention to when you first use it? 1.Open your Bluetooth on your iPhone 2.Plug the earphone connector into your iPhone 3.Click on your Bluetooth interface manually to establish the connection What should you pay attention to the next time you use it? 1.Open your Bluetooth on your iPhone 2.Connect your earphone with your iPhone and just wait for a few seconds then it will connect automatically. Compatibility: use with iPhone 7 / 7 Plus / 8 / 8 plus / X. Support all the iOS systems. Contact us at any time If you have any questions. NOTE: As this product is wired Bluetooth function earbuds, So you must open the Bluetooth on your phone to connect before you use it.