booster pro 2 percussion deep tissue massage gun latest noise reduction technology, 9 speeds, 5 massage heads carrying case booster booster pro 2 is the most advanced model in the market. this is the powerful massage gun with 9 levels of speed control which is the top level you never seem. it is a sleek, ergonomic, and portable massage hammer tool. with at least 3 hours of continuous use (other massagers last from 20-40 minutes) and multiple heads and 9 speed settings, 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