This revolutionary deep muscle treatment uses rapid, repetitive strokes to stimulate blood flow & heat. Our unique 16 mm stroke length & industry-leading speed delivers the most effective muscle treatment of any handheld device. Product includes the following attachments: Travel Case (2) Swappable Lithium-ion Batteries Dampener- Tender areas or near bones Large Ball- Large muscle groups Standard Ball- Overall use Wedge- For scraping, shoulder blades, or IT bands Thumb- Lower back and trigger point therapy Cone- Pinpoint muscle treatment