![4girls 4koma :t =_= anger_vein black_legwear blonde_hair blue_eyes blue_hair blush brown_hair closed_eyes comic drooling elza_straherz fang feathers hairband heart hitachi_magic_wand inkwell japanese_clothes jitome kamishiro_seren kimono maid miniskirt moaning multiple_4koma multiple_girls o_o off_shoulder open_door open_mouth original pink_hair pleated_skirt pout purple_eyes quill rakurakutei_ramen scroll shirt sitting skirt smile spoken_heart table tatami tears thighhighs translated ujikintoki_kinka ujikintoki_tamaryu vibrator white_skirt wince writing yellow_eyes zettai_ryouiki rating:s score:6 post #1007821](/cdn_image/preview/c6/b3/c6b3100c637a6bd256f8af1d88b83b43.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.