The LED penlight is well constructed, durable and lightweight to ensure superior performance. It is the perfect medical tool for doctors, nurses, EMTs, first responders, paramedics and nursing students. Bright white LED light ideally helps you to perform daily work such as inspection of sore throats, ears, eyes or noses. A pupil gauge is featured on the side of the penlight; this comes in handy when measuring the pupil dilation of a patient’s eye. Powered by 2 AAA batteries are not included.