Bell + Howell Tac Pen featuring a flat head and Phillips screwdriver, self-defense strobe light, emergency escape tool, bottle opener, whistle, and writing ink pen. Multitool - Aluminum – Outdoor and Indoor Tactical Gear – Glass Breaker +LED Flashlight +Screwdriver + Bottle Opener. REPLACEABLE INK and LR44 BATTERIES. Tac Pens Battery and ink are both replaceable. So say goodbye to those other products that are good only until the built-in battery loses power or the after the ink runs dry. Please refer to images for break down of components. PORTABLE & COMPACT With a 7” collapsed length, as mentioned, the Tac Pen is similar in size to your standard office pen, so you can carry it with you anywhere, inside your purse, your glove or overhead compartment. More so, the thickness is just perfect so you can actually comfortably write with it!