Panasonic KX-TG5771BXS Service Manual page 57

8.1.8. Adjustment Mode for Handset
Cross Reference
(*1) Adjust Battery Low Detector Voltage (Handset) (P.80)
Note:
(*2) These are the default values.
(*3) These values may not be fixed depending on the battery strength.
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KX-TG5771BXS/KX-TGA570BXS