17 KEY DESIGN: This steering wheel controller is equipped with 7 customizable functions, which is convenient for controlling multimedia or answering phone calls through the steering wheel while driving. 2ROUND SILVER APPEARANCE: It adopts exquisite clock shaped round silver design, which has good adaptability and can add a sense of fashion to your car interior. 3MULTIFUNCTIONAL DESIGN: Support one key switching of multimedia playback, Bluetooth answering and hanging up calls, multimedia volume adjustment, voice functions, etc. 4UNIVERSAL TYPE: Universal wireless steering wheel controller with good compatibility, widely applicable to vehicles supporting steering wheel control functions. 5STABLE AND RELIABLE: Strict product quality control is carried out before leaving the factory to ensure product quality, easy installation, and improve driving safety. Item Type: Steering Wheel Control Button Material: ABS Color: Silver Battery Model: CR2025 Battery Capacity: 150mAh Rated Battery Voltage: 3V Functions: One key switching of multimedia playback, Bluetooth answering and hanging up calls, multimedia volume adjustment, voice functions, etc. Applicable Models: Universal 1 x Controller 1 x Receiving Box 1 x Manual 1. Before purchasing, please confirm whether your host supports the steering wheel control function. (Conditions are available: 1. The setting interface of the navigation machine has the function of steering wheel learning or steering wheel setting; 2. The tail line of the navigation integrated machine has a steering wheel control line. Viewing method: the navigation integrated machine case sticker has a steering wheel control line and a navigation integrated line tail line label can find the corresponding steering wheel control label, usually marked with steering wheel control 1, steering wheel control 2, steering wheel control A, steering wheel control 0, steering wheel control grounding, etc.).2. This product is a universal steering wheel controller, compatible with most rear& 8209;mounted car navigation hosts (original CD, please do not purchase original host). But we do not guarantee that the buttons of this product are 100% matched If there are 1& 8209;2 keys that do not match, it is normal. If you cannot accept the above description, please do not buy.3. The product only supports the host side control signal voltage of 3.3V& 8209;5V.