1. Material: ABS 2. Scope of application: children/students/groups who need to correct sitting posture 3. Nail-free installation, no damage to the desktop 4. Reading with a large viewing angle, without obstructing the viewing angle 5. One key to adjust the lift, easy to operate 6. Large space for activities does not prevent children from writing 7. Stable and not easy to fall 8. The silicone sleeve can be removed and cleaned, simple and convenient 9. Weight: about 410 grams 10. Size: 8.8x30 cm, retractable 11-22 cm