The ultimate 4-in-1 pen equips you with multiple tools in a single pen. This ballpoint pen has black ink and has a chisel-tipped yellow highlighter when flipped to its other side. You can even use the pen's cap as a stylus on any of your touchscreen devices. This pen also has a built-in flashlight you can turn on by unscrewing the barrel and pushing on its bulb. The light in this pen is an extra bright white LED light. Before you use the light, make sure to first insert the included battery into the pen.