Can one turn on the radio on Audi A4 when the engine is off or does the engine need to be turned on?

I had some work done on my car and somehow, the radio can now be turned on without the engine being turned on. Am just concerned that the alarm has also been turned off.Can one turn on the radio on Audi A4 when the engine is off or does the engine need to be turned on?it's all normal, don't worry!Can one turn on the radio on Audi A4 when the engine is off or does the engine need to be turned on?I'm pretty positive car radios, clocks, etc. are powered by the cars battery. That's why you can still have stuff like the lights and the radio on when the car isn't actually running.Can one turn on the radio on Audi A4 when the engine is off or does the engine need to be turned on?Simply test the alarm yourself. If it doesn't work, fix it.Can one turn on the radio on Audi A4 when the engine is off or does the engine need to be turned on?
i have a 98 audi and you CAN turn on the radio with no keys in the ignition. just push the knob in and then push it again and it will come out and the radio will come on