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  1. 1V 4V REAR GAIN/ LEVEL CONTROL See charts on back for accurate gain/level settings. www.probox.com • 800.919.3313 INCORRECT GAIN/LEVEL SETTINGS USING 4V HEAD UNIT 4V 2V

  2. Push 2X LED indicator when in AUX mode; no control knob functions Control knob Bluetooth®

  3. LED indicator when in AUX mode; no control knob functions

  4. Indicator light will turn white when AUX mode is activated.

  5. JK4 Installation Guide Mounts to existing factory bolt-on locations. Removable in 5-10 minutes.