Audiovox UDV7 User Manual

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UV7
Disconnecting the Battery
To prevent a short circuit, be sure to turn off the ignition and 
remove the negative (-) battery cable prior to installation.
NOTE: If the UV7 is to be installed in a car equipped with 
an on-board drive or navigation computer, do not 
disconnect the battery cable. If the cable is 
disconnected, the computer memory may be lost. Under 
these conditions, use extra caution during installation to 
avoid causing a short circuit.