The SR-PAX2 is a two channel audio mixer with preamplifier, phantom power, numerous inputs and outputs, a great display and the ability to use 9-volt batteries.  

I am selling this incredibly versatile unit that offers so much value for the price.  It is built like a tank and sounds great as shown in the reviews below on Youtube.   I bought it to use with my GoPro Hero 9 before the Pandemic, but never used it.  It is also excellent of course mounted under a DSLR camera. It is in the box with the plastic still on the display.   

Curtis Judd - https://youtu.be/XWYhUBQ4lJo

Please let me know if you have any questions.  Thanks