[EASY TO CARRY]: The 94*30MM design makes this product more convenient to use, even if you need to go out and carry it, it will not cause trouble, and it is convenient for you to take it to any place. [EASY TO USE]: Turn on the buttot the bottom of the vein locator, put the vein finder close to the skin, and the vein will be displayed as a shadow or dark line. Note: Choose a dark room to display better. [QUICK POSITIONING]: Vein finder can be used for venipuncture, such as injection, physical examination, infusion, blood draw, etc. of individual or clinic patients; suitable for arms, back of hands, insteps, inner wrists and other body parts. [SUPER LIGHT SOURCE]: LED light source, 9 F5 round-head red LEDs, the farthest can illuminate 1 meter/3.3ft, using 3 AAA batteries, the brightness can reach 50LM, the product does not contain batteries.