The BR-E3 part of Misc is part of a modular system designed to customize and personalize controllers for gaming. The BR-E3 is a physically small module which provides three extra buttons and can easily be attached and removed using a simple snap-in mechanism. These buttons can immediately be programmed to specific functions, making them particularly useful for PC and console gaming. This is ideal for those who want to add a few extra options to their controllers on the fly.