An electrically-driven device 10 with a handle 12 and a head 16, wherein the head comprises a head base 18 being coupled to the handle and movable in at least two dimensions relative to the handle, and a skin treatment head attachment 20f including brush unit transmission 202, 204 and a brush unit 200 rotatably coupled to the brush unit transmission, a second head attachment including a skin treatment implement 200 constructed to treat skin or a cutting unit 22 constructed to cut hair, wherein each one of the skin treatment head attachment and the second head attachment is releaseably engageable, one at a time, with the head base. The device further comprises a motor 30, the motor being contained at least partially within the handle; a first transmission 32 coupled to the motor; a first driven shaft 46 coupled to the first transmission, opposite the motor; and a second driven shaft 48 coupled to the first transmission, opposite the motor; wherein the first transmission being constructed to translate rotary motion of the motor to linear, reciprocating motion of the first driven shaft and to the second driven shaft; and wherein, when the skin treatment head attachment is releaseably engaged to the head base, the brush unit transmission is coupled to one of the first or second driven shafts and translates the linear, reciprocating motion of the coupled first or second driven shaft to rotary motion, rotating the skin implement.