1. Create an upright posture and prevent children from myopia 2. T-shaped arc without edges, more comfortable and caring for children 3. The upgraded chest board design allows the baby to lean forward, shift the bodys center of gravity forward, and sit upright naturally without leaning on the table. 4. No screw design at the bottom, easy and effortless assembly 5. Material: ABS resin 6. Clamping thickness: 0.1-6.5 cm, suitable for most tables 7. Adjustable height 15-24cm, suitable for both children and adults