This is an external battery, how to install it is at the buyer's discretion.We do not guarantee that this external battery can be installed on all kinds of refrigerators，thank you
OUTPUT: DC12V/4A MAX8A
USB OUTPUT: DC5.1V/2.1A MAX3.6A
Compliant power supply can be fully charged in about 5 hours and can be charged 20,000 times.
The battery can be charged by using the power adapter of Alpicool or the vehicle DC12V/4Acable. For other brands, please pay attention to the output voltage and current, so as not to damage the battery, and also can leave a message to the buyer. This item contains only batteries.