Question
Can I use the device on a wet surface?
Answer
Yes, of course.
Question
What wavelength of red light does it use?
Answer
It uses 630-670nm.
Question
How do you charge it?
Answer
A USB Type C cable is included.
Question
Can I use it on my face?
Answer
We do not recommend using it on the face. A better alternative would be to use it on arms, legs, back, chest, feet and hands.