The Buyers Products part number 6391215 describes a Pre-Wired Switch with Momentary Button. This switch is designed to control various electrical accessories, most commonly strobe lights, and allows for both simple ON/OFF operation and the ability to change flash patterns using its built-in momentary button. It comes with a 15-foot pre-wired cable and can handle up to 10 amps, making it suitable for mounting in a vehicle's dash or console.