((((Working great)))) Look at the pictures for more details dewalt 30 amp car charger/starter /alternator check/reverse polarity/extra plug/usb The 80 Amp Bench Battery Charger packs an entire garage full of useful gear into a single bench battery charger. This charger features fully automatic 12V charging for marine and automotive batteries, immediately determining whether your battery needs a rapid bulk charge or a slow trickle charge to keep it topped off. It's also got a patented 80 Amp Engine start to help get your vehicle back on the road fast. An alternator test function is also included to perform crucial diagnostics and a voltage meter to keep an eye on charging