Panasonic KX-P8420 User Manual

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Before You  Start
Minimum space requirements 
Power source
The voltage level of the power source must not vary more than ±10% from 
the voltage level marked on the nameplate (located on the back of the 
unit).
Do not use an extension cord.
Do not use a line conditioner, transient suppressor or surge protector as it 
may cause a machine error.