Specifications:Type: Controller KeyMaterial: ABS+PCColor: BlackShape: Half MoonNumber of keys: 5 button, 10-buttonShape: Half MoonController Key Size(L*W*H ):10 x 4.4 x 3.5 cm/3.9" x 1.7" x 1.4"Receiver Box Size(L*W*H ): 4.3 x 3.7 x 1 cm/1.7" x 1.45" x 0.45" Features:1.Easy installation and removal.2.Built in battery powered, ultra low power, batteries can use from one year to two years.3.Applicable to most of the market with direction control function of DVD navigation.4.This controller is universal, you don't need to remove the original steering wheel control to make it work.5.Can support 5 buttons and 10 buttons two choices, to meet the common operations of the car.6.Super touch designsmall space occupationside buttonwill not cause the wrong operation by steering the wheel.7.Integrated arc design, perfect compatible with a variety of car steering wheel, does not affect the steering wheel cover.8.Being flexibly installed along the steering wheel as you like, this controller is easy to use and helpful to keep safety for your driving. Installation Method:1.Remove the DVD navigation.2.Navigation host, in the tail line to find the steering wheel multi-function control line, ACC line, ground wire, specific line function, please consult the navigator manufacturers.3.The receiver has a corresponding bit line marking stickers ACC for automotive ignition wire, GND wire, KEY1, and KEY2 side control line, will connect the corresponding line, if only one party host navigation control line, please receive box with green and white line at the same time and received the navigation, for receiving antenna yellow. Please install after straightened as close as possible to the steering wheel, away from the navigation host location without fixed wiring.4.Enter the DVD navigation settings, find the multi-function button learning (steering wheel settings), press and hold the button to learn the corresponding function (see DVD navigation instructions for specific operations) Attention1. 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. Please make sure the receivers positive electrode & negative electrode connect correctly, also insulating the terminals to avoid damaging other facilities. Package Included:2 x Controller Key (Battery Installed)1 x Receiver Box1 x Cable4 x Screws and Nuts