Table 1.

Appearance and description of the device.

①	Power cord	Connects power to the main board
②	Body cover	For safety, a cover protecting the user’s contact part
③	Exhaust vent	Ventilates the interior of the device
④	Power switch	Turns on/off the device
⑤	Body cover	For safety, a cover protecting the user’s contact part
⑥	Cable holder	Fixes the power cable
⑦	Current fuse	Protects the product from excessive current
⑧	Roller	Acts mechanically by direct contact with the human body
⑨	Rotating core	Rotates the roller continuously
⑩	Bearing	Rotates the roller more softly
⑪	Support	Separates roller contact with the human body in each rotation