Does this belt burn fat or help me lose inches?

No. Megelin markets it for a temporary boost in blood circulation, relief of stiffness and relaxation. It is a Class II light therapy device, not a weight-loss product, and no evidence supports fat loss from it.

What is the difference between the 660nm and 850nm light?

Red 660nm light acts mostly near the skin surface, while 850nm near-infrared penetrates deeper into tissue. The belt runs both, so a session covers surface and deeper layers at once.

How does it compare with a red light panel?

A panel covers a larger area at a fixed distance; the belt wraps a single body part and stays close to the skin. The belt is more portable and flexible, the panel better for treating the whole body at once.

Can I use it on my back, knees or shoulders?

The adjustable strap is designed to wrap different body sizes, so it can sit on the waist, back, shoulder or limb. Keep the LEDs close to the skin, since intensity falls quickly with distance.

Is it safe to use every day?

It is an over-the-counter Class II device intended for short sessions. Follow the included instructions, avoid staring into the LEDs, and check with a doctor if you take photosensitizing medication or are pregnant.