USB Electric Massage Yoga Massager Muscle Soreness Pain Relax Stovepipe Vibration Acupressure Massage Column Foam Roller Block Specification USB version Product name: USB three-zone electric pillar 1 The charging time is 1.5 hours Color: space grey/gouache orange The working time is not more than 15 minutes USB charger Input: 100-240 - v - ~ 1 a Output: 3.7 VDC - 1 a1 Vibration frequency: 1 hz 2 20 hz Band 3 hz 4 35 hz