このBluetooth、USB 3.0のノイズにボコボコにやられてるので、障害物なしでもイヤホンは有効範囲約5m（音が途切れない範囲）ですね。
Mastodon is the best way to keep up with what's happening.
Follow anyone across the fediverse and see it all in chronological order. No algorithms, ads, or clickbait in sight.
