This decoder is not supplied with a speaker as the model comes pre fitted with them F0. Lights On/Off F1. Sound On/Off F2. Horn 1 - Double Tone F3. Horn 2 - double tone F4. Horn 3 – single tone F5. Buffer up F6. Coupling up to a train F7. Flange squeal F8. Guards whistle F9. Carriage door slam F10. Fan F11. Buffer clash on wagons F12. Compressor F13. Brake release F14. Acceleration/Brake override F15. Shunting mode/half speed F16. Seagull F17. Aux 2 Switch off Reds No.2 end When f0. ON F18. Aux 1 Switch off reds No.1 End When F0. ON F19. Aux 3 Cab Lights No.1 end F20. Aux 4 Cab Lights No.2 End F21. Aux 6 Engine Room Lights IF Fitted