Convenient and easy to use, this is by far the most time-saving you've used for smoothing the dry, rough skin on you heels. It took about five minutes to sand your extremely rough heels ta a sandal-ready state. Keep the inner part of the cleaning brush clean. Please air-dry the unit after long-time use. Away from dry, rong, or sensitive skin, and skin with acne or skin be burned-out. Softly and equably massage your skin with the cleaning brush. Please sue less time to tend your neck, as the neck has thin skin. Tidy the accessories termly to make them durable for use. Please keep the accessories away from children. Please use elastic to enlace you hear to avoid estoping your face and entwing in the accessories. Please be sure to take the batteries out after every use.