Great for presentations, job sites, home use and more, this 3-function pen includes a laser, flashlight and pen. The lights can be used together or separately for a wide variety of uses. The black ball-point pen features ultra-smooth tracking and retracts for safe, easy storage. 3 electric AG 13 cell batteries are needed to operate laser . To insert, disassemble the pen as shown in diagram, following the correct battery polarity. Bright white LED flashlight. Powerful red laser pointer. Smooth ball point writing pen. Storage case included.