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RCA H5450 User Manual

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Sound Signals
Signal
Meaning
Single short beep 
Successful key entry 
Single long beep 
Successful operation
triple short beep 
Power oN (cordless handset)
 
Unsuccessful key entry
a long warbling tone (cordless handset)  Signals an incoming call 
one long beep 
confirmation tone
one long beep and two short  
beeps every minute 
low battery warning