The medical penlight is made of anodized aluminum clip to hold it on your uniform, easy to carry, push-buttonbright clear light on/off switch low power consumption and long use time. It is great for doctor and nurse use. Customized logo can be printed on it by laser engraved. Batteries are not included. The medical led penlight has a handy dandy little pupil dilation gauge which is incredibly helpful if you are learning how to visibly measure pupil dilation. The price includes the shipping cost to CA, QTY over 10000pcs by ocean.