1 - [Replace Factory Radio] - Used to replace the factory oem radio with your aftermaket new radio. | 2 - [Factory Antenna Adapter] - Used to connect vehicle factory antenna to an aftermarket radio. | 3 - [IMPORTANT] - The wires are standard EIA color-coded, however, due to [Variations in (Vehicle Model) or (Aftermarket Radio Model)], the connection method may vary. In some cases, need to match wires by function rather than color, to do so, it's important to check 【BOTH Radio Wiring Diagrams】 of [(Aftermarket Radio) and (Vehicle Radio System)]. [Aftermarket Stereo Harness diagram is offered by Aftermarket Radio Manufacturer] | 4 - [Red ignition wire] - Not for all vehicle models, but if OEM radio harness of your vehicle has no ignition wire, aftermarket stereo can not be turned off/on through OEM radio harness. To solve this issue, need to get power from the ignition by running the red cable separately from the [OEM radio harness]. Simply attach one end to the ACC wire of the harness that comes with aftermarket radio, and connect the other end to the ACC wiring position located behind vehicle's ignition switch. | 5 - [Note] - Will not retain some features like steering audio controls, rear DVD audio etc unless extra adapters use. Does not fit vehicles with 6 speakers system, this wiring harness is usual for car standard stereo, not compatible with amplified systems like Bose, Infinity, etc | 6 - [DB11 Packing List] - 1 x Stereo wire harness; 1 x Car antenna adapter; 16 x Butt Connectors