Features: 1.2 kinds of massage head ; 9 kinds of intensity 2.Fusion of modern biotechnology; 3.Without piercing the skin to do acupuncture; 4.Simple operation, easy to carry; 5.Safe and effective, with no side effects; 6.Automically search the acupuncture,it will not work if not find the acupuncture and if meridian obstruction; 7.Transient pulse; 8.Accurate physical therapy; 9. Three types of heads for choose and possess three main functions: (1) Dome type:Superficial therapy, which is applicable for health care and facial beautification; (2) Node type: Node therapy, which is applicable for partial body pains; (3) Spheroidaltype: Partial therapy, which is applicable for quickly alleviating pain. 10.Affordable family use Voltage:DC1.5V(one AA battery, not include) Output:3.7V;300mA+/-50mA Pulse Frequency: 0.01-300Hz Pulse Width:100us-320us Maximum Output Extent:500ohm Load Voltage: 3.3V Dimension: 200*30mm Package Includes:(No Retail Box, packed by Bubble) 1 x Meridian Energy Pen 1 x Spheroidal Type Head 1 x Dome Type Head 1 x Manual Please Note: Treatment principle of Electronic Acupuncture Pen is used electrical pulses to to stimulate acupuncture points then to activate cell and dredging the channel, while there is a condition to generate the electrical pulse,that is,current's positive and negative poles must be turned on. The pen is a monopole current(the nib) output, so the other pole current should be conducted by hands and form circumfluence with the nid of the Electronic Acupuncture Pen ,so that it will produce electrical pulses.So it is normal to feel a little numbness of the holding hand, it is how the meridian pen works, not quality problem.