Bluetooth Connection: The charging case has a Bluetooth sync button and is of original quality, fully matching air pod 1st & 2nd generation. After the initial connection, it will automatically connect when you open the cover again. If your case is lost or damaged, this is a very nice option.It is not compatible for Gen 3 and Gen 4.It is only compatible for Gen 1 2. Large Battery & Fast Charging: The battery capacity of the charging case has been upgraded to 450 mAh, which can provide you with up to a day of use. The earbuds can be fully charged in just 20 minutes, and the case can be fully charged in just 2.5 hours. The large battery and fast charging allow you to immerse yourself in the music world at will. Indicator Light: The charging case is equipped with a power indicator light. You can easily grasp the power level of the case through the status of the indicator light. Dual Charging Methods: The earbuds charging replacement case can support wired charging and wireless charging, al