I just had some questions about it I want to use the ever start max 1200 amp jumper as a 12 V source and Im unable to do that I have been unsuccessful getting a number to be able to talk to somebody if you could help me get a number where I can get a human being on the phone Id like to talk to a tech about it thanks for your inquiry User's recommendation: Stay away from the digital technology on these jumpers they are misleading.