2 Kinds of Lights (White / Warm), each of the pen light (white light) is equiped with extra bulb (warm light). You can replace its bulb to change the light. Warm light is suitable for checking eyes, white light is suitable for checking throat, nose and ear.

Convenient to use: these nursing pen lights are push-button on/off switches with pocket clip. It is easy to control and place them on your uniform pocket.

4 Packs AAA batteries Included: coming with batteries, each medical pen light needs 2 packs batteries to be powered, with placing the positive pole "+" direction of batteries to the pen bulbs.

With pupil gauge and a 5cm ruler: it's helpful for you to measure the pupil dilation and length on using these pen lights. They are great gifts for nurses doctors nursing students.

Lightweight and Convenient: these pen lights are light and compact, convenient to carry anywhere.