![1girl black_dress black_legwear blush breasts dress fate/grand_order fate_(series) glasses greyscale hair_over_one_eye hitachi_magic_wand jacket large_breasts looking_at_viewer mash_kyrielight monochrome necktie nokoppa panties panties_under_pantyhose pantyhose pussy_juice short_hair skirt solo_focus spread_legs thighband_pantyhose through_clothes translation_request underwear vibrator rating:e score:9 post #2659199](/cdn_image/preview/40/5a/405ad76f177cf36e3bd22d76a6e2c143.jpg)
An electric massager first released in the 1970's for medical use, it was quickly picked up and utilized as a sex toy. It looks like a strange microphone with a white and/or gray head that vibrates.
Its pixiv tag is 電マ (den-ma), an abbreviation for 電動マッサージ機 (electric massager). Not to be confused with denki anma.