The HomeLink® System (1) learns the codes for up to three remote-controlled devices through a simple training process. HomeLink can then activate those devices at the push of a button -- all from one unit permanently mounted in the vehicle's sun visor, overhead console or mirror. There's no transmitter clutter in the vehicle, no batteries to change or individual transmitters to misplace. HomeLink is rolling-code compatible, is powered by the vehicle's charging system, can be reprogrammed at any time and can activate home lighting with the available HomeLink Lighting Package.