Features： 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 Button 1 x Receiving Box 1 x Manual  2 x Rubber Installation Accessories  2 x Double Sided Tape