1) READ THE OWNERS MANUAL!!
2) If you turn the radio on with the key out,it will stay on for 20 or 30 min(I'm not sure)
3) AGAIN , READ THE MANUAL !!
This SHOULD be one of the FIRST things you do with ANYTHING new you buy!!!
(doesn't anyone understand this)
He's only telling the truth. there's a good chance Diana's question would be answered in the manual.