1.Upper Back Brace: Posture corrector adopts ergonomic 8-shaped design to perfectly fit the spine and pull it straight. It helps with effortless bad posture correction, effectively relieve back pressure, and improve your posture. Especially for 2.Vibration Function: The latest back correction with vibration has a massage effect on the back. All strengths are concentrated on the back. Just 2 hours a day, and you'll feel confident to reshape your figure 3.Stretchable & Breathable: Back straightener, made from resilient nylon, is more comfortable, it can be adjusted to accommodate all sizes of bust, and allow your sweat to ly go through to maintain coolness 4.Long-lasting Use: Posture Trainer with a high-precision chip and 500mAh large-capacity battery is specially used to improve your using experience. Suitable for women, men and young groups