huíshēngdìngwèi
ㄏㄨㄟˊ ㄕㄥ ㄉㄧㄥˋ ㄨㄟˋ
Simplified 回声定位
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 回聲定位 and it comes back until you know it.