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[Sturdy and infallible] Born for sports!! [Worry-free after-sales] Support 30 days for no reason to return or exchange!! Differences in each version: 1. The extreme version is Bluetooth 4.2, the normal version is Bluetooth 4.1.2, and the extreme version is listening It takes about 3-6 hours to sing or call, and the classic version listens to songs or calls for about 1-2 hours! 3. The supreme version has bass, the classic version does not! 4. The supreme version can make and receive calls, but the classic version cannot! Note: Standby refers to the state of being turned on but not connected to the phone, not the use time!