two electronic devices on a table next to each other

WIRELESS BASS KNOB. ($249.99)

Buy it here 👈🏼

Wireless Volume Controller

Home / Car Audio

Bluetooth Control

2 Channel Stereo

Full Range - 1Hz - 30Khz

Low level

0v - 20v CH input/Output Capable

monitor cars battery voltage

(( 8-16.7 VDC)) on your remote