Simple operation, integrated power switch, venipuncture for childrend the elderly, blood vessels can be found during intravenous injection Press the vein gently with both hands, and then slowly move the device left and right. Veins will be shows shadows or dark lines, and will appear in the red glowing periphery around the device to locate difficult-to-find blood vessels An instrument specially used for facial puncture assessment of blood vessels, using healthy red, can directly display the superficial blood vessels of the skin Lightweight design, easy to carry around, which is very useful for traveling doctors and nurses, and can provide you with help at home