![1girl :< alice_margatroid anal_beads bad_id bad_pixiv_id ball_gag blonde_hair blue_eyes blush censored daive dildo doll egg_vibrator gag gaping highres hitachi_magic_wand minigirl mosaic_censoring pussy pussy_juice shanghai_doll short_hair solo spread_legs spread_pussy tears too_many too_many_sex_toys touhou translated vibrator rating:e score:5 post #420939](/cdn_image/preview/24/e6/24e65b99b2466ebd08f48c12f9ba14cf.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.