Ultra-light and Portable: weight only 1.8oz. its slim and lightweight design makes it very easy to carry. Just i dark room, you can see the veins that are previously invisible to the human eye. Battery Operated: Powered by 3x AAA batteries, (Not Include battery) this vein detector light can be used anywhere in home, office, indoor and outdoor, no plug socket needed! Vein finder flashlight: This easy-to-use venous detector is ideal for nurses, caregivers and medical students to help locate veins and reduce the pain of venipuncture. High Performance Red LEDs: 9 Round Red LEDs help you find vein path quickly and easily. Easy to use. Just press the button on the bottom of the vein finder.