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https://hanzama.x0.to/2020/09/02/the-super-directional-compact-speaker-called-sray-dime-which-can-be-heard-only-by-one-person-but-can-be-used-for-telework/
1人にしか聞こえないけどとにかく便利!テレワークにも使える超指向性コンパクトスピーカー「SRAY」(DIME)