Universal two-point adapter, the adapter can move freely or be fixed on one position by moving the lock lever, and the ball-turning knob can experience 360-degree rotation. The hooks on the two ends are stretchable by releasing the lever. Place the device in the bracket and make sure it is safely clamped, and adjust the tuning knob for the best viewing angle. This middle car seat tablet holder is easy to install. The hooks on both ends of the tube are telescopic and can be easily attached to the headrest post, so no special tools are required Allows for 2 seat poles distance between 500-660mm and pole diameter within 10-14mm The stretchable tablet holder length: 18.5-30cm, which allows mounting 7-11" tablets A long journey is no longer boring, you can use your tablet to watch movies, listen to music and play games. It provides fun for those sitting in the back row, especially for children Compatible with: Amazon Fire HD 7 ASUS Google Nexus 7 Lenovo Yoga 8 B6000 Samsung Galaxy Tab 4 7.0 T230 Samsung Galaxy Tab 4 8.0 Samsung Galaxy Tab S 8.4 iPad Mini 3 / 2 / 1 iPad Air iPad Air 2 Other 7-11" Tablets Compatible with: Universal Models Package included: 1 x Universal 360 Degree Rotating Car Headrest Mount for 7-11" Tablets (H55-1) Accessory only, device not included