It is the laser acupuncture pen, you can adjust the top circle to adjust the circle diameter. And once you got the parcel, turn the key to the green point which at the end of the pen; then press the power button, the laser light will has the output. The COZING-T04 has the treatment protocol, if you order it, please share the order number, we can send you the treatment protocol for free. No need operate absolutely same as the treatment protocol, it is for the reference only, the simple way is where you pain, then you irradiate that part .
If you wanna close it , then turn the key to the red point.
For the charger, it has + and - on the charger, and put the battery inside into the charger, you can charge the battery.
