Product Description 1. The pen lights with bright lights are a good helper for your daily chores, as well as lighting items that you need to check your child for a sore throat, ear or nose on a daily basis2. Safe material: The pen light is made of high quality aluminum alloy and recessed LED lamp, which is not easy to break and strong enough for everyday use; Our lamp pins have 2 types of lights; The white light is great for neck viewing so you can see clearly without hurting.3. Suitable size: The pen light is about 1 * 13.5CM, which is easy to carry and doesn't take up much space, so you can put it in your backpack or bag4. Easy to Use: Compared to the other types, this reusable LED pen lamp is a push button to turn on and off instead of holding the clip down, these reusable pen lights have push button switches with pocket clips that easily fit in your uniform pocket which makes them very easy to use and carry.5. Versatile: The pen light with the pupil meter and the ruler board on both sides are very useful for measuring the pupil size and neck, the light pen is suitable for home care and daily care