Feature: 1. 10 Keys: The wireless steering wheel control button has an ultra thin design, 10 custom functions, with smoother touch. 2. Function: Car bluetooth media button supports all functions, such as volume +/‑, mode, bluetooth phone, pre or next etc. 3. Description: This is car steering wheel control key button for your stereo, please confirm your car stereo supports Steering Wheel Control function. 4. Built In battery: Universal car steering wheel control button has built in CR2025 battery, the battery capacity is 150mAh. 5. High Quality: The manufacturing strictly follows the factory quality control, can be used for a long time. Specification: Item Type: Steering Wheel Media Button Material: ABS, PE Battery Model: CR2025 (built in) Battery Capacity: 150mAh Rated Battery Voltage: 3V Functions: One key switching of multimedia playback, Bluetooth answering and hanging up calls, multimedia volume adjustment, voice function, etc. Applicable Models: Universal. Package List: 2 x Wireless Steering Wheel Control Button1 x Receiving Box1 x Manual 2 x Rubber Installation Accessories 2 x Double Sided Tape Note: 1. This product is a universal steering wheel controller, compatible with most rear mounted car navigation hosts (original CD, original host please do not purchase). But we do not guarantee that the buttons of this product are 100% matched. If there are 1‑2 keys that do not match, it is normal. If you cannot accept the above description, please do not buy.2. The product only supports the host side control signal voltage of 3.3V‑5V, and this product has a built in 3V CR2025 lithium battery.