Features: Application to most of the DVD navigation with direction control function. Can be installed quickly & improve driving safety probability. A total of 10 keys can be customized to set the function. The keys with LED light, you can also see clearly at night. Installed without removing the steering wheel can avoid damaging the steering wheel. Button on the side can avoid the incorrect operation which caused by hitting the steering wheel. Installation: 1. Remove DVD navigation. 2. Finding out multifunctional steering wheel control line, ACC line & ground line from the navigation host tail lines. 3. Stickers on receiver shows the specific line, ACC is ignition line, GND is ground line, KEY1 & KEY2 are direction control lines, please connect all the lines according to instruction. If there is only one direction control line in the navigation host, please connect the green & white line to navigation. 4. Finding multifunctional button learning interface (steering wheel settings) in the DVD navigation settings. 5. Enter into Android or DVD navigation, matching the button, it will takes about 10 seconds to pair. If match successfully, you can see a red light from the receiver. Specifications: Color: Black Material: ABS Product Size:10*3cm/3.9*1.2in Package Size:16*10*4cm/6.3*3.9*1.6in Package Weight:127g/4.5oz Package List: 1*Receive Box 2*Ten Button Keys 1* power cord(set) 2*screws(set) Note: 1.In order to avoid to be interfered by some of navigation and get better reception, please straighten the receive antenna as close as possible to the steering wheel. 2.When pressing the button, please guarantee the time will more than 0.5 seconds, if not, the key may not be identified. 3.This product need installed by professional, we will not bear any responsibility for the bad consequence which caused by your own unauthorized installation.