Miata Radio Power-Off Delay

This is one of those features you don’t think about, but really miss when you don’t have it. When you turn the car on, the radio is powered up (same as always), but when you turn the key off, the radio stays on. The radio continues to play until you open the door. Open the door, and the radio instantly shuts off. If you don’t open the door, the radio will continue to play for up to 15 minutes.