Electric percussion massager provides full body relaxation helps relieve stress and improves blood circulation. Adjustable vibration speed and intensity allow for lighter or deeper tissue massages. The battery can be charged using a USB charger in a maximum of 1 5 o'clock. Lightweight and compact design makes the massager easy to carry and take on trips.. The massager is especially useful for people with neck or back pain with muscle fatigue or knee and shoulder injuries.