Just a little hint of advice, from my recent experience with one!!!
Make sure your hands are clean!!!! I cannot stress this enough. I got finger prints on the back, where it is sticky, and with the light on, those areas are darker, and it looks like a$$.
They are also very prone to scratching, so
DON'T REMOVE THE CLEAR PROTECTIVE FILM unless it is seated properly, and you are ready to reinstall the needles.