How does it work?

Infrared light is used to display blood vessels on a screen.
It is a robust stand with a harmless infrared led light and an intelligent sensor that detects the light, which is reflected by the blood in the veins under the skin. It is presented on a clear TFT screen where you can see both the vein and the needle.  The screen functions as a tool to find veins first timer ight.  
With the reflection mode the elbow and underarm are easy to reach. The transillumination mode is designed especially for pediatric access on the hand. The patient holds the LED in the palm of his or her hand. The camera registers the light that shines through the skin. Which presents the veins and the needle on the flat screen.