INPUTS AND OUTPUTS: This 4 band parametric equalizer features input gain adjustments, a voltage LED indicator, a rotary fader, output volume control, sub output volume/sweep/wide control, & two selectable low pass crossovers (60Hz/90Hz). COMPATIBLE WITH BLUETOOTH: This equalizer features built-in Bluetooth for wireless music streaming and is accessible through simple & hassle-free pairing. Works with any Bluetooth-compatible device. EQUALIZER CONNECTIVITY AUX: Featuring pre-amp line AUX inputs via RCA jacks, you can plug in any audio source via the 3.5mm AUX input jacks and be able to equalize the audio playback. Select source via the source/AUX/BT selector. PARAMETRIC EQUALIZER DIMENSIONS: This compact equalizer has a half din size, with a total dimension of 4.8” x 7.2” x 1.0” (L x W x H). Has a maximum weight of 1.32 lbs. BUILT TO LAST: Made with iron and aluminum, this 4-band equalizer will surely prove its longevity for long-term use.