Features ---Short circuit protection (LED goes out, charging stops) ---Wrong connection protection (LED turns red, charging stops) ---Battery is full (LED turns green, charging stops) ---Charging time varies with the size of batteries. ---12V 5-7AH takes about 6 hours; ---12V 9AH takes about 10 hours; ---12V 15-17AH takes about 13-15 hours. Specifications ---Application: For All 12V Hydrochloric Acid Batteries(14.4V) ---Input: AC 110-240 V, 50-60HZ ---Output: DC 12V 1A ---Plug: US Plug ---LED indicator: Green=Battery full. Red =charging. ---Input Wire length: 60 cm ---Output Wire length: 100 cm Package includes ---Two (2) PCS Battery Chargers Maintainers with Alligator Clips.