Kneading Foot Massager R.T.F1) Targeting all age groups (>18 years old)& both genders " Especially effective for housewives, working individuals with heavy fieldwork and elderly. 2) Kneading Massage to ease muscle ache. 3) Suitable for Home & Office use. 4) Acts on foot to reduce fatigue. 5) Every massage time is automatically set to about 15 minutes. 6) Re use, please re set according to the model key massager to repeat a cycle of 15 minute massage. ? Higher frequency vibration