USB rechargeable and eco-friendly design: Note: It may be too bright for the eyes, if you don't like it. Our nursing light pen has a built-in rechargeable lithium battery and you cancharge the lamp with the included USB cord. The lamp can be fully charged in 2 hours and lasts for 3 hours. The light becomes dimmer when the power is off. Premium Durable Stainless Steel Pen Body: Our pen is made of premium silver stainless steel than plastic and aluminum alloy pens. Also, the overall look is nice and sturdy.You will definitely love it. It can also be a perfect choice as a gift for your friends and family. Compact and Lightweight: The LED light is designed as an EDC flashlight to fit in your pocket, shirt, pants and even attach to a key ring. Compact and lightweight making it versatile for many applications. Multifunctional use of the super luminous pen: do not use it to check the eyes because it may be luminous. The lamp is not only designed for medical use in hospitals and schools, for nurses and doctorsto check the nose, throat and ears, etc. Besides, the penlight can be used as a flashlight at night for your daily use because the light is very bright.