Contoured to the Back, Spine, and Neck - Ergonomically contoured Wave Duo is the ultimate portable vibrating muscle relief device, targeting areas on either side of back, neck, and spine. What’s Included - Wave Duo device and USB-C Cable. This device has an internal battery with a 200 mins. total battery life. Revolutionary Technology - The Wave Duo device has 5 powerful vibration intensity settings that can be adjusted to your comfort level via the Therabody App to help release soreness, reduce tension, and increase range of motion. Innovative Wave Texture - Made with hypo-allergenic EVA high-density foam for advanced sound insulation. Designed with innovative silicone wave grooves, the Wave Duo's shape is ergonomically contoured to the spine to target muscles around the the back and neck. Industry Leader - Therabody's been innovating ways to take charge of your daily wellness for over a decade with products like Theragun, TheraFace facial treatments, RecoverAir Leg compression, Wave Series rollers, and PowerDot muscle stimulation.