BVC is a vascular detector module designed to facilitate medical personnel in locating blood veins. The BVC vein-visualizing device is designed with an adjustable visible light of 600-750um based on the light absorption characteristics of deoxygenated blood. This enables medical personnel to quickly locate blood vessels and differentiate them from muscles. The vein-visualizing device can also be used repeatedly as it is designed with a UV sterilizer wireless charger. For hemophilia patients, for example, this product can largely reduce risks derived from the injection of clotting factors.