Waist Back Massager - Dual Frequency Vibration MassageThis product uses graphene heating technology, combined with artificial hand vibration massage. Built in traditional Chinese medicine energy Bianstone, massage lumbar intervertebral disc, relieve waist discomfort. Graphene has a better heating performance than carbon fiber. It heats up quickly and heats evenly. It effectively acts on the sore parts of the waist and makes waist push more comfortable. Bianstonetherapy is a traditional Chinese medicine