1Built?in replaceable button battery. 2Support 7?Key function customize and background light. 3Support all function such as(Vol+/?,Mode,Bluetooth phone,Pre/Next etc.) 4This steering wheel remote control button is made of wear?resistant, non?slip material for high durability and long service life. 5The steering wheel button has a comfortable feel, allowing users to use it for a long time without feeling uncomfortable.1 x Remote Control1 x Signal Receiver1 x User ManualMaterial: ABS+PC _x000D_Size: Diameter 46mm*12mm _x000D__x000D_Notes: _x000D_1. Manual measuring, please allow 1 ~ 3mm error, thank you. _x000D_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. 1Built?in replaceable button battery. 2Support 7?Key function customize and background light. 3Support all function such as(Vol+/?,Mode,Bluetooth phone,Pre/Next etc.) 4This steering wheel remote control button is made of wear?resistant, non?slip material for high durability and long service life. 5The steering wheel button has a comfortable feel, allowing users to use it for a long time without feeling uncomfortable.1 x Remote Control1 x Signal Receiver1 x User Manual