1. Function: Improve sitting posture, relax the cervical spine, care for eyesight, free hands, and open books with one hand 2. The height can be adjusted freely, adjust to head-up reading 3. 10~40cm height can be adjusted, adults and children can use it comfortably 4. The elastic book holder design makes the book stable 5. 1KG weighted frosted alloy base, anti-slip, stable and durable 6. The book holder stretches freely, the width of 11-52 cm is adjustable, and it can hold books of A6-A4 size 7. Multifunctional clip design, can hold books, can clip mobile phones/tablets, music scores, etc. 8. Dual-use model (optional): Two modes can be easily switched, upgrade a dual-use, take off the panel in one second, easily switch the reading mode, convenient to take away 9. Material: Aluminum Alloy/ABS 10. Dimensions: base 19 x 2.5 cm, total height 41.5 cm