WITH SYNC BUTTON – This upgraded airpods charging case is with Bluetooth pairing button. It can not only charge the airpods, but also pair your airpods with your iPhone. THE BEST REPLACEMENT CHARGING CASE – It is a perfect replacement charging case compatible with your Air Pods. If you have lost your original charging case or want to have a backup charging case, this product will be your best choice. QI STANDARD WIRELESS CHARGING – This wireless charging case supports all Qi standard wireless chargers. It has a protective chip inside which can make sure your Air Pods earbuds are well protected while charging. For your convenience, it also supports charging with a cable. BUILT-IN BATTERY – This wireless charging case has a lightweight battery of 450mAh built inside. It can fully charge your Air Pods for 5 times. With this case, you will never worry about power shortage. WARRANTY – We make our products with great care. The built-in chip can protect your device from short circuit,over voltage,over current and over charge. You will have 1 year warranty. Please contact us if you have any questions.