Characteristics: -40 dB low noise, 70Hz high frequency stimulation. -Reduce muscle stiffness and pain and improve blood circulation. -Increases the range of motion and improves the health of your body's soft tissues. -30 level adjustment speed settings provide up to 4,200 visits per minute -6 interchangeable heads. -The custom soft massage head provides a comfortable massage experience while reducing bone damage. -The medium range charge lasts 3 hours, and once for 20 minutes, it can be used continuously for a week. Instructions for use (Read before using) Fully charge the battery up to six hours before first use To charge Connect the DC end of the supplied 24 V adapter to Charge the battery part and plug the AC side cord into the wall outlet LED battery lights press to show the battery level and indicate the active charge Full charge is indicated when all LED lights come on The battery can be recharged at any time and at any battery level It is not recommended to completely drain the battery to the level of red LED The average operating time is 2 hours depending on the speed level and the pressure applied