***** **********Best Quality Guranteed. *****Convenient DesignOne-handed installation and release within 2 seconds. *****Compatibility of the headrestThe distance between two metal posts on your headrest should be 4.9 in- 5.9 in. *****Compatibility of the deviceCompatible with smartphones/ tablets/ Switch 4.7" - 10.5". It is the screen diagonal measurement, not the width. *****AdjustabilityMulti-angle rotation to adjust for the best viewing angle. *****StatementWhenever there is any quality problem you meet from our product, we will take responsibility and solve it to your satisfaction immediately.