Frequency divider only, other accessories demo in the picture is not included! | Special current capacitor, soldering-free terminals, more convenient and fast wiring, reasonable designed and full materials. | Every component is selected after repeated tests, from material selection to finished product, and every process is strictly controlled to achieve better sound quality. | Home/car subwoofer subwoofer subwoofer frequency divider, hall-level sound effect explodes the audience, creating your exclusive customization and awakening the buried sound. | Independent frequency adjustable switches, get rid of the shackles and to your thoughts, and adjust the sound quality you want according to your need