Brand: MYAMZ YZHFeatures: ➤When using the pen, you will fill in the effect (hands, shoulders, knees, nerves, ankles, muscles, tennis elbow) because it serves as a ground electrode to complete the circuit. Simply change the grip or hold the device more with your hands to disperse the effect.➤The Acupuncture Pen has 5 different Heads for different FUNCTIONS: 1，SPHEROIDAL: which is applicable for quickly alleviating pain. 2，NODE TYPE: which is applicable for partial body pains. 3，DOME TYPE: Superficial therapy, which is applicable for health care