45ms delay is lower, playing games and watching movies, synchronicity is better, only represents the synchronization of sound and picture, low value indicates less delay, high value indicates more delay, the sense of non-synchronization of the picture will be larger.
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The delay of Bluetooth headphones generally has little impact, when listening to songs, the ear almost does not feel any discomfort, but playing games, especially eating chicken or cf shooting games like this, both will have a certain impact, choose Bluetooth headphones, it is recommended or focus on the Bluetooth chip, which has a great impact on sound quality