Precautions:
1. Use this product in a bright environment as it does not emit light.
2. If the pen is lost, it can be replaced with another one. Do not damage the surface with sharp objects.
3. This product is not waterproof, so do not get it wet or put it in water.
4. Avoid using in high or low temperature environment, working temperature is -5 ℃ -40 ℃.
5. Since it does not have a built-in memory card, it cannot be connected to a mobile phone or computer, and photos cannot be stored.