Feature: The vein finder can display the veins precisely and clearly Improving the success rate of the first venipuncture Shortening puncturing time, improving work efficiency Reducing the pain and anxiety of patients Reducing the risk of infection Stable and reliable Easy to carry Easy and convenient to use Durable in use Suitable for hospitals, pediatric clinics, outpatient clinic centers, clinical laboratories, nursing homes, etc. Perfect for stargazing and map reading, volunteer work at night, and sea turtle night patrols during turtle season. Description Material: ABS Color: Black Size: As shown in picture How to Use: 1. Press the button on the bottom of the device to turn on the infrared LED. 2. Press gently on the skin with your hands and slowly move the device from one side to the other. Veins will appear as shadows or dark lines. (Note: The device must be in contact with the skin when looking for veins. Removing light from the skin will not show anything.) 3. Once veins are 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 need to be moved further away because it may be too bright and obscure the vein. It is best to follow the vein path to get a complete view of its size and direction. (Note: It is best to find a vein that follows a straight path.) Package Included: 1 x Black Vein Finder Device (3 x AAA battery not included) Note: 1. Our sizes are Asian sizes, 1-2 sizes smaller than European sizes. Please choose your size according to the size chart. 2. Due to manual measurement, there may be a size error of 1-2 cm. Item color displayed in photos may vary slightly due to different monitor settings.