Features:-There are 2 light modes, you can switch between white light and warm light mode as needed, white light is suitable for checking nose, mouth, ears, warm light is suitable for checking eyes.-Built-in 60mAh rechargeable battery, you can charge it at any time through a mobile power bank or computer (charging indicator light: blue light is on when charging, blue light is off when fully charged).-With on/off button, one-touch on/off. Protective cover prevents accidental opening. Metal clip makes it easy for you to carry it with you.-There is a pupil gauge and a 4cm ruler on the side which is very helpful for measuring pupil dilation and length.-Perfect for doctors, nurses, home, office and more.Specification:Color: silver, blackBattery capacity: 60mAhSiz.