20n Squelch OffPress this key to hear background noise. Press the keyagain to return to normal operation.n Super Lock-CPress and hold this key for 4 seconds to lock the transceiverkeys. Super Lock-C locks the transceiver keys to preventaccidental operation. Turning the transceiver power OFF andthen ON again will not disable Super Lock-C. To deactivateSuper Lock-C, with the transceiver power OFF, press andhold the PF-2 key while turning the transceiver power ON.• When the LED lights yellow, release the PF-2 key.• While Super Lock-C is activated, you can still perform thefollowing actions: PTT, Squelch Off, Monitor, Power, Volume,Channel Up/Down.n Super Lock-PPress and hold this key for 4 seconds to lock the transceiverkeys. Super Lock-P locks the transceiver keys to preventaccidental operation. Turning the transceiver power OFF andthen ON again will not disable Super Lock-P. To deactivateSuper Lock-P, with the transceiver power OFF, press andhold the PF-2 key while turning the transceiver power ON.• When the LED lights yellow, release the PF-2 key.• While Super Lock-P is activated, you can still perform thefollowing actions: PTT, Squelch Off, Monitor, Power, Volume.n Tone AlertPress this key to toggle Tone Alert on and off. Tone Alertprovides an audible alarm when signals are received on thefrequency you are monitoring.• When Tone Alert turns ON, the LED indicator color cyclesthrough green, light blue, blue, purple, red, and yellow, andwhite approximately every 30 seconds.• When a signal is received, the LED indicator color cyclesthrough green, light blue, blue, purple, red, yellow, and whiteapproximately every 5 seconds.• Tone Alert ends once a signal is received. To reactivateTone Alert, press this key again. Press any key to stop the5 second LED indicator cycle.