Because Bluetooth doesn't have the ear-returning function, because Bluetooth headphones have a certain sound delay, and ear-returning requires ultra-low delay sound feedback, so the ear-returning function will not be used on Bluetooth headphones for the time being. In addition, the phone has no ear-returning function, so the ear-returning function cannot be used when using the ear-returning function.

"National karaoke" is a karaoke software produced by Tencent, which has the functions of intelligent scoring, professional mixing, friend challenge, tuning, interesting interaction and social sharing. On September 20 10/4, the ios version of national karaoke was launched in the appstore, and received rave reviews after it was launched. On August 26th, 20 14, the download of national karaoke songs that karaoke players expected officially started, and it was released on September 6th, 20 14. As Tencent's first karaoke dating application, "National karaoke" has the original function of repeating song paragraphs, and has the functions of intelligent grading, interesting tuning, friend challenge, interesting interaction and so on.

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