GENUINE TEKONSHA Brake Controller P3 is the most advanced and intelligent approach to trailer brake controls. P3, requiring no manual levelling, is a technological breakthrough among inertia-activated brakecontrols. Equipped with a self-adjusting sensing device similar to the one used in guided-missile technology to allow for easy, flexible installation from nearly horizontal to nearly vertical P3 constantly adjustsitself to the position of the tow vehicle.