Vivitar DSLR AF Flash Pro 648 Power Zoom VIV-PRO-648 User Manual

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Make sure the On/Off Switch is in the Off position.  Slide 
open the Battery Compartment Cover and insert 4 x AA 
batteries with correct polarity(-,+), as indicated in the 
battery compartment. Close the Battery Compartment 
Cover. Inserting batteries with the wrong polarity may 
cause the batteries to heat up, leak, explode and damage 
the flash. When you need to replace batteries, make sure all 
batteries are of the same brand, type and same capacity.