![1girl arms_behind_back bar_censor bdsm black_legwear blush bondage bound bound_arms breasts brown_hair censored dildo egg_vibrator girls_frontline hair_ribbon half_updo hitachi_magic_wand inverted_nipples kneeling large_breasts long_hair luggage navel nipples phandit_thirathon puffy_nipples red_eyes red_ribbon ribbon scarf solo thighhighs torn_clothes torn_legwear very_long_hair vibrator wa2000_(girls_frontline) rating:e score:11 post #2918113](/cdn_image/preview/49/f9/49f91b841f347d89d89b2058bfceca9b.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.