On sale 50% off today! Pain Relief 2. 0 is the Android version of the 5 Star Rated Pain Killer 2. 0 for iPhone. Put your headphones on and run these special frequencies and YOUR PAIN MELTS AWAY IN MINUTES. It lasts for hours. Great for sports injuries, back pain, Arthritis, Fibromyalgia, headaches, migraines and any pain. Pain Relief 2.