BOOSTER X is the most popular model with all the needed features. X provides 5 speed levels for helping relieve muscle soreness and stiffness / Improves range of motion / Promotes circulation / Accelerates warm up and recovery. It is a sleek, ergonomic, and portable massage hammer tool. With at least 2-3 hours of continuous use (other massagers last from 20-40 minutes) and multiple heads. You can always get to those hard-to-reach places. It’s perfect if you enjoy sports, training, CrossFit, or any other sports. It’s ideal for pro and elite athletes as well as for casual use. It is quiet...Whisper quiet when compared to other massage guns. No obnoxious power tool hammering sound - only lightweight quiet muscle and joint relief. Reduced pain, improved flexibility, injury prevention, enhanced recovery can all be yours in one simple solution