Ergonomics design. Lightweight&poratble size and soft handle easy for users to hold and operate. Precise detector. Adopt with the latest bio-technology sensor, which can test the Moisture and oil in your skin accurately and quickly. A necessary skin care product for you. According to the tested data, you can know which type of your skin is, hydrated or oil. So you can know how to care for your skin. Different skin condition will be showed by different LED color, keep you konw the health situation of your skin. Safe and reliable. Power by 2*AAA battery and latest biotechnology is appied, it won’t produce any side-effect and no painfulness to your skin.