Lithium ion smart charger. Use for K2's K2B12V batteries. LED indication light, green for power on and charge complete (not charging). Red for Charging. 50/60Hz 100 - 240VAC input. Certified CE, UL, FCC, and RoHS. Specify SAE connection attached pigtail, or Fasten 250, or Alligator Clips, or Ring Terminals in the comment section when ordering.