KZ AZ09 Bluetooth Earphone Ear Hook 5.2 Wireless Bluetooth Module Upgrade Cable, Style:B 1. It is very simple from pairing to operation, just move your finger, you can easily achieve a variety of requirements. (Functions vary by device) 2. Professional sound quality comes from the dual support of the chips blessing and AAC advanced coding capabilities. Adopt AAC advanced audio coding transmission technology to greatly improve the quality of hearing and bring natural and clear sound. 3. The Bluetooth module can be used for about 6 hours when it is fully charged, and the charging bay can last 8-10 times. 4. Bluetooth 5.2 chip, stable connection. 5. Devices with Bluetooth can be connected, and the compatibility is strong. Whether it is IOS system or Android, it is all compatible, and there is no need to worry about the length of the headset wire. 6. Bluetooth version: 5.2 7. Bluetooth range: 15m 8. Earhook battery capacity: 50mAh 9. Battery capacity of charging compartment: 800mAh Note: This product is only a Bluetooth upgrade earhook, without earphones.