Easy to assemble: For assembly, the holder can be attached with one hand without tools and can be removed in 2 seconds. Compatibility with the headrests: The tablet holder is only suitable for car headrests with two metal supports that can have a distance of 12.5cm to 15cm. (Before buying, make sure that the holder is compatible with your car. ). Compatibility with the devices: It is suitable for iPad / Samsung Tabs,between 4.7 inch and 10.5 inch devices. Adjustability: Multi-angle rotation with ball joint to set a perfect viewing angle. Features:360 rotation allows you to freely adjust the device to the best viewing angle. The extendable leg is easily adjusted so that it can be easily assembled. With short arms can prevent shaking. The holes for charging and headphones are available. Compatibility:The distance between two metal posts on your headrest should be 11cm - 15cm. The tablet holder car is suitable for different sizes of devices from 4 to 11 inches, e.g. iPad Air, iPad Mini 4, iPad 4/3/2/1, iPad Pro 10.5 / 9.7, iPhone X / 8 plus / 7 plus, Fire HD 10/8/7, Huawei Mediapad M3 / T3, Google Nexus 7/10 , Samsung Galaxy S10 / S9 / S8 plus / note 8 / A5 / Galaxy Tab A / Tab S3, Nintendo Switch, Kindle etc. Material:ABS plastic anti-vibration and anti-friction premium aluminum alloy.