Booster M2 adopts smart strike technology and AI mode, which can adjust the massage intensity and speed level according to the pressure applied by the user. With a massage depth of 80 mm, it easily penetrates large muscle groups. This is an effective massage gun for you. This massage gun can adjust the massage intensity and speed level according to your needs, it can also bring you a different massage experience with 6 different massage heads, you can use it for 10-15 minutes at the same time to relax your muscles. Massage Heads: 6 massage heads.