Features: Color: Black Size: 95x29mm One of the most difficult parts of blood collection may be finding the appropriate vein. Some patients are 'difficult people'; Their veins are either very small or very deep, which makes it difficult for healthcare professionals to easily and quickly locate them. 2. Repeated acupuncture is painful for patients and may also reduce their confidence in their acupuncture ability The blood drawing doctor is operating a stick. Although our device can help you easily find veins for smaller clinics or facilities, and even for collectors and Amateur enthusiasts, it is suitable for most people to find veins with minimal sticks. How to use: Step 1: Try to minimize the amount of light. A dark room will display the best effect. Press the button at the bottom of the device to turn on the infrared LED. Step 2: Gently press the skin with your hand, then slowly move the device from one side to the other. Veins will appear as shadows or dark lines at the edge of the device, emitting a red glow. Attention: When searching for veins, the device must come into contact with the skin. Extracting light from the skin will not reveal anything Step 3: Once the vein (dark shadow/line) is found, reposition the infrared light around the area for optimal visual acuity. If the vein is shallower than the surface, the light source may have to move further as it may be too bright and cover the vein. It's best to follow the venous path so that you have a complete visual dimension and direction. Attention: It is best to find the vein along a straight road. Including: 1x black flashlight (excluding 3xAAA batteries)