Cordless Rechargeable Blue Light Pen

💙It works on black color areas.
💙9 levels of light output speed and 4 levels of light intensity can be set arbitrarily.
💙Press the side power button, the pen will output light.
💙Cordless handheld, easy to carry and use.
💙 Operation Method:
1. Press the frequency mode select button to select the frequency, then set the output energy size
2. After setting, press the light emission switch to output energy
3. During operation, wear glasses
4. Keep the machine clean
5. After use, please keep it properly after cleaning