excellent product for the $, a great investment for better health. used it for arthritis in knee, 6 treatments later, no pain! using it on my partner who has suffered from Shingles for 3 yrs. this is helping to relieve the nerve pain very well in just a few treatments. the booklet included w/laser is easy to read & understand, comes w/battery & recharge unit, safety glasses, portable case & larger one too. great buy!! we love it...