Willow Curve PT-5 low-level light therapy Pain Relief Device, still in the original box, never used. The Curve utilizes a combination of infrared light, visible red light, and gentle heat to treat pain. These are the very last of the Willow Curve units ever produced, made in the USA. Unit and battery packs are GUARANTEED to function as intended. I make NO specific claims about the medical effectiveness of this device, but those who own and use the Curve often recommend it! See my other listings if you need an original Willow Curve replacement battery, or an extra to keep on the charger. These are not available from anywhere else.