The medicube Booster V Roller is a roller type EMS beauty device head designed for advanced at home care. It is used in combination with the Booster Pro Mini Plus device and delivers targeted EMS stimulation through a rolling motion to help support facial contour care, elasticity, and muscle massage.When used with the dedicated gel, the roller helps transmit electrical stimulation smoothly to deeper muscle layers, supporting firm looking skin and helping relieve facial puffiness. Its ergonomic V shaped roller design allows easy rolling along facial contours and can also be used on various body areas such as the shoulders, arms, and calves.