I am a professional auto repair shop and because we never want to leave a customer with a dead battery we use chargers to keep the batteries alive during repairs. Thanks to the hook, this charger can be hung on the hood latch very conveniently. It is compact, lightweight and reliable to use. Just press the start button and leave it alone. It topped a 4 charge battery from full to full overnight and charged most vehicles within the 3-4 hours I described. Overall very happy with the first week.