Designed for car owners who value sound quality, this volume controller works with a variety of car audio systems and subwoofers to optimize incar listening. Key benefits Function: remote control to adjust the volumes of your car amplifier and subwoofer, enabling precise sound management. Compatibility: suitable for a wide range of car audio setups and subwoofers. Performance: provides quick and reliable volume adjustments from the driver's seat. What you get A practical tool for ontheroad use, allowing you to balance levels without distractions. How it helps in real use City driving with passengers: quickly tune bass and volume for different music and voices. Highway trips: maintain a comfortable listening level over long distances without reaching for the head unit. Road trips with diverse content: easily switch adjustments for music genres, podcasts, or speech. Notes Function, compatibility, and onroad usability are the core attributes of this volume controller. No information about size or material is specified.