Everyone loves the stock Sequential Tail Lights of the 2010+ Mustangs. They look fantastic, however the one minor issue is that they only sequence when used as turn signals. But Raxiom has solved this problem with their Plug-and-Play Tail Light Sequencer to add additional sequential modes. When activated the turn signals or hazard lights will sequence from the center light out and repeat until switched off. When the car is locked/unlocked or when the brakes are applied, the tail lights will sequence once and then stay lit during braking. The Raxiom Sequential Tail Light Harness Kit is assembled from state of the art electronic components with a simple plug-in connector that easily insert into the stock wiring harness. This kit includes two inline unit harnesses, one for each side, that replace your factory harness. The Raxiom Mustang Sequential Tail Light Harness Kit is a direct plug-in replacement for the stock wiring harness. Simply unplug the stock harness and plug in the new Raxiom sequential harness in it's place, it is that easy. PLEASE NOTE, this is a product designed for Mustangs sold in the US. It will not function properly on Mustangs sold in the EU or UK without modifications being made to the wiring harness.