Details: *100% brand new and high quality *Built-in replaceable button battery. *Support 7-Key function customize and blue background light. *Support all function such as(Vol+/-,Mode,Bluetooth phone,Pre/Next etc.) *Suitable for all cars, it is suitable for a wide range of applications. Specification: *Type:Car Steering Wheel Key Volume Remote Control *Condition: 100% Brand New Color: Black / Silver *Material: ABS+PC *Size: Diameter 47mm*13mm *Compatible: Universal Package list : 1 x Controller Key 1 x Receiver Box 1 x Strong Sticker 1x User manual Instructions: 1 Remove the link between the car and the junction box red power cord black ground wire white square control line 2 Open the settings, find the steering wheel learning interface, click the corresponding in the picture, and pre the button corresponding to the controller 3 Turn on the player after learning the function and start your wirele control tour Notes: 1. Manual measuring, please allow 1 ~ 3mm error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture. Product Picture Feedback If you have any problems with our items or services, please feel free to contact us first before you leave negative feedback. We will do our best to solve any problem and provide you with the best customer services.