Note: The use effect of this product will vary according to the structure of the human body. The hospital’s special equipment for checking blood vessels is more suitable for you. This vein finder is more suitable for observing veins on the back of the hand wrist arm and leg. The vein finder works better in dimly lit environments. When you use the vein viewer device to look for veins be sure to touch the skin and place it where you want to see the veins. If it is too far from the skin you will not be able to see anything. This vein viewer health gadget can only find superficial veins. If you want to see deeper veins it is recommended to use a unique device. Please do not look directly into the light with your bare eyes when using this device to avoid damage to your eyes. It is usual for the product to get hot when used for too lon