Features: Color: Black Size: 95x29mm 1. One of the hardest parts of taking blood is finding the right vein. Some patients are "difficult"; their veins are either small or deep, making it difficult for health professionals to locate them easily and quickly.2. Repeated acupuncture is painful for the patient and may also reduce their confidence in the phlebotomist's ability to perform acupuncture.3. Although this device of ours can help you easily find veins in smaller clinics or facilities, even for collectors and hobbyists, it is suitable for most people to find veins with minimal sticks.How to use: Step 1: Minimize light. Dark rooms will show the best results. Press the button on the bottom of the device to turn on the IR LED. Step 2: Gently press the skin with your hand and slowly move the device from side to side. Veins will appear as shadows or dark lines that will appear on the periphery of the device, glowing red.Note: The device must be in contact with the skin when looking for a vein. Removing the light from the skin will not reveal anything Step 3: Once the veins (shadows/lines) are found, reposition the IR light around the area for best vision. If the vein is shallower from the surface, you may have to move the light source further away, as it may be too bright and cover the vein. It is best to follow the vein path so that you have full visual size and orientation.Note: It is best to find a straight vein.Package includes: 1* red light flashlight