This was received from someone else. There are no instructions. It is unused. Loosen the screw on the cap ring on the back of the holder, and pass the ball joint of the mount base through the cap ring. Push the ball joint into the socket on the back of the holder and tighten the cap ring. Loosen the clamp knob on the mount base to open the clamp, position the clamp around the pole as needed, and tighten the clamp knob. Use the top of the mobile phone to push up the top camp of the holder to open the holder, place the mobile phone in the holder, the clamp will return, press the handle on the back of the holder to lock it, and rotate the mount to adjust to your preferred viewing angle.