What is the difference between red and near-infrared light here?

Red light sits in the visible range and near-infrared is invisible and penetrates deeper. The pad runs both, so you get surface and deeper exposure in one session.

Can I use it on my back as well as my neck?

Yes. The 31 by 14 inch pad is long enough to drape over the shoulders or lay across the back, and it flexes to follow the body.

How long is a session?

Sessions typically run 10 to 30 minutes depending on the setting. The built-in timer shuts the pad off so you do not have to watch the clock.

Is it as strong as a rigid light panel?

No. A mains-powered panel usually delivers higher irradiance. The pad trades some intensity for flexibility and hands-free use.

Do I need eye protection?

It is wise to close your eyes or wear the included eye protection when the light is near your face. Do not stare directly into the LEDs.

Check with a doctor first if you are pregnant, take photosensitising medication or have a skin condition. It is not a substitute for medical treatment.