国产午夜精品久久理论片小说_free欧美日韩免费在线观看_在线成人亚洲一区_国产成人亚洲欧美激情_久久大香线蕉综合爱_国模吧一区二区精品视频_少妇中文免费三级_高h猛烈失禁潮喷无码无广告_亚洲欧美另类成人综合图片_苍井空被躁50分钟视频

Bluetooth speaker refers to a sound device that is equipped with a built-in Bluetooth chip and replaces traditional cable connections with Bluetooth connections.

Bluetooth speakers are mainly portable speakers, with a generally small and portable appearance. Bluetooth speaker technology has gradually been valued and accepted by consumers due to its convenient characteristics. Common Bluetooth speakers on the market are mostly single channel speakers (single speaker units), and there have also emerged some multi-channel speakers with excellent sound quality (two or more speaker units).