Usa 66 Radio Problems

I bought the USA 66 radio from custom auto sound (wouldn't suggest there company). But I was wondering if anyone that has bought it has the same problem or knows how to fix this problem. It is fm and auxillary but every time I push the button to switch to auxillary it doesn't work any ideas on what is wrong?
 
no matter how times i warn against getting one, i always end up replace them in the end. My best friends dad got one for a 55 Ford wagon.It wouldnt turn off after a day of use, I had to take it back to CAS, they replaced the left knob switch, no questions, but i still have no faith in thier product.