Power supply, ignition, backup and equipment power supply

1. MEM/CLK

2. HOUR/TUN

3. SNOOZE/DIMMER

4. MIN/TUN+

5. 12/24H, SCAN/SLP

6. ALARM2/VOL-

7. ALARM1/VOL+

8. ON/OFF

9. ALARM 1

10. ALARM 2

11. SNOOZE

13. SLEEP

14. FM

15. PM

12. DISPLAY

16. USB OUTPUT

17. DC POWER INPUT

18. FM ANTENNA

19. BATTERY COVER