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    Today I learned (todayilearned@noc.social)'s status on Friday, 15-Sep-2023 09:25:41 JSTToday I learnedToday I learned

    TIL: Early wireless TV remote controls (1956), commonly known as "clickers", didn't have batteries or electronics. When you clicked the button, an ultrasonic sound was emitted by the button striking the bar. This sound was picked up by the TV to operate it.

    https://en.wikipedia.org/wiki/Remote_control
    #til #todayilearned
    https://www.reddit.com/r/todayilearned/comments/16iun1c/til_early_wireless_tv_remote_controls_1956/

    In conversationFriday, 15-Sep-2023 09:25:41 JST from noc.socialpermalink

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