Feature:1. One of the hardest parts of taking blood can be finding a suitable vein. Some patients are 'difficult sticks'; their veins are either very small or deep, preventing health professionals from finding a site easily and quickly.2. Repetitive needle sticks are painful for the patient and may also lower their confidence in the ability of the phlebotomist performing the stick.3. While our this device to help you to find veins easily for smaller clinics or facilities, even for collectors and hobbyist, it is suitable for most of people for finding veins with the least sticks.How to use:Step 1 : Minimize light. A dark room will show the best results. Press the button on the bottom of the device to turn on the infrared LED.Step 2 : Press gently on the skin with hand pressure and slowly move the device from one side to the other. Veins will appear as shadows or dark lines that will appear on the periphery of the device that glows red. Note: The device must be in contact with the skin when looking for veins. Taking light out of the skin will not show anythingStep 3 : Once the vein is found (dark shadows/lines), relocate the infrared light around this area to get the best visual acuity. If the vein is shallower to the surface, the light source may have to be moved further because it may be too bright and cover the vein. It is best to follow the vein path so that you have a complete visual size and direction. Note: It is best to find a vein that follows a straight road.Specification:Product Material: aluminum alloyProduct Size: 9.5x2.6cmLED: 9pcs F5 Round Red LEDsPower Supplies: 3 x AAA Battery (Not Included)Switch gear position: One Mode Maximum Brightness: 50LMLighting time: about 0.5hour for a regular battery and about 2 hours for an alkalines batteryMaximum Range: 1 meterLens material: mirror TPU materialincludes:1 x LED Flashlight Vein Finder