What is the difference between 660nm and 850nm?

660nm is red light that acts mostly on the skin surface. 850nm is near-infrared, which penetrates deeper into tissue. The belt uses both, so you get surface and deeper exposure in one session.

Can I use it on other body parts?

It is shaped and sized for the back. You can drape it over a shoulder or hip, but the fit is less secure and coverage is limited compared with a panel.

How long are sessions?

Most users run 10 to 20 minutes per area. Because the belt is less powerful than a full panel, expect the longer end of that range for a meaningful dose.

Is it safe to use every day?

Daily use is common with red light devices. Keep sessions short, avoid looking directly at the LEDs, and check with a doctor if you take photosensitizing medication or have a skin condition.

Does it come with a charger?

It ships with its power adapter and controller. Check the listing for the exact plug type if you are buying outside the US.

How does it compare with a red light panel?

A panel is more powerful and covers more area at once. The belt wins on portability and hands-free back coverage, so it suits people who want convenience over maximum output.