Metra Electronics

Metra Electronics (Holly Hill, Florida) is an American automotive electronics company established in 1949, specializing in audio electronics systems and 12 volt accessories.
Brands.
Metra is an international electronics company, with the following global technology partnerships:
Bluetrek - design and production of wireless communication devices such as Bluetooth headsets and car-kit speakerphones; VIBE Car Audio - British car audio brand. Parent company of FLI Audio;
Audio Solutions - TV audio mounts;
Connects 2 - producer and distributor of car audio integration and related accessories;
Ballistic - Sound suppression systems;
The Install Bay - Installation professionals;
Shuriken - batteries for car audio systems;
Icarus - Home theater accessories.
Universal steering wheel control interface.
A universal steering wheel control interface can be employed on most any vehicle with steering wheel controls, to be used with aftermarket radio and head units, like Pioneer, Sony, Alpine, Kenwood, Eclipse, JVC, Valor, Boyo (Vision Tech), Dual, Visteon, Advent and Blaupunkt.
It is used to retain the OEM steering wheel controls. It has the ability to auto-detect many vehicle makes and aftermarket radios and it will preset the steering wheel controls to the aftermarket radio automatically, so no programming is required. 
If desired it can be manually programmed so the user can make the steering wheel controls function the way they want them to, only limited by the functions of the aftermarket radio.