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1. Detect veins deeper than 10mm

2. If the vein is too thin (less than 1 mm), it cannot be displayed accurately. Because the needle has a diameter, veins with less than 1 mm are generally not suitable for needle insertion.(For example:neonates )

3. It cannot show the veins through the tattoo.

4. Overweight & Obesity (Over 150 kg)

1. Infants (3-7 years old)

2.Obesity (less than 150kg)

3. Edema (swollen tissue)

4. Hypovolemia (a decrease in the volume of circulating blood in the body)

5. Dark skin

6.Hairy skin

7.older people's veins