**********Convenient DesignOne-handed installation and release within 2 seconds. *****Compatibility of the headrestThe width between two metal posts on your headrest should be 4.7 in- 5.9 in. *****Compatibility of the deviceCompatible with smartphones/ tablets/ Switch 4"- 10.6". It is the screen diagonal measurement, not the width. *****AdjustabilityMulti-angle rotation to adjust for the best viewing angle. *****ExtensibilityThe stretchable arm can be extended up to 10.6 in.