• Universal car headrest mount for Tablets and smart phones from 3.5-13 inches. • Clip onto back of seat's headrest, suitable span of 2 post up to 8.5 inches. • Adjustable height range from 5.6cm to 26.6cm, available for most of smart phones and tablets • Rotary type lock knob,360 degree rotation and up&down movable. • Recessed armlock, more fastness and safty. *Simple and quick installation, no tools required • Made of 100% new raw materials, RoHS conformity