The Check Point easily attaches to your club by slipping it into the club shaft near the head and sliding it up until snug. Each laser uses an included AAA battery (cheap and easy to replace).
1. Work on taking the club back to waist high, keeping the first laser on the stripe.
If the laser is pointing outside of the stripe, the hands are working too much away from the body. If the laser is inside of the stripe the club head is swinging too much around the body.
2. Work on getting the second laser to enter the target side of the stripe as the hands swing from waist high to the top of the swing. If the laser points outside of the stripe the club is too flat. If the laser is inside of the stripe the club is too steep.
3. Make 10 very slow motion swings with the lasers tracking the stripe back and through. Using another club without the lasers on it, hit five shots trying to replicate the same feel. Repeat this process.