I hesitated to buy any light products like this since I had never tried one (some spas use them for anti-aging on the face). Am so glad I did! I really noticed the results on my wrist which gets carpal tunnel problems from working on computers & playing the piano. After the 1st day of treatments, it was better! It's easy to hold on to & use. I keep mine in the bathroom so I remember to grab it & do a quick treatment whenever I see it there. You do short 30 second treatments (has a timer which turns off the light). I slowly move the Tendlite around the joint so I can cover more area more quickly. I also bought the Red MD light for facial treatments (age spots, wrinkles) since I now know these lights work!