CM/CS Series User ManualFront panelRear panel1. Microphone input jack (+ XLR CM60)2. MIC volume control3. LINE IN volume control4. USB/SD volume control5. MASTER volume control6. FOG button7. SIREN button8. ALERT button9. VU meter10. USB/SD audio player11. POWER switch12. Mains voltage switch13. IEC mains inlet & fuse holder14. DC power terminals15. COM speaker terminal16. 8Ω speaker terminal17. 100V speaker terminal18. LINE OUT connectors (RCA)19. LINE IN connectors (RCA)