I bought the TENDLITE to use on my mini dachshund who had injured her spine and lost use of her back legs. After complete rest and steroids she regained use of her legs, but had weakness on her right side. After using the TENDLITE on her spine area 2-3 times a day for two minutes on each area for the last 3 weeks, she is showing great improvement. The strength is returning to her right side and she is hardly stumbling. I did have a problem with the charging unit not working. I contacted Lumina customer service and within a few hours I received a reply saying they would send me a new charger along with 2 more batteries for my inconvenience. I’m, so very pleased with the results of using the TENDLITE and their excellent customer service!!