20 Watt 12 Volt Portable Solar Trickle Battery Charger & Maintainer Made of high efficient solar cells, work great in direct sunshine. IP65 waterproof design, no worry to place it outside, totally free maintainence. Full protections-Over charge protection,discharge protection, over current protection, short circuit and reversed polarity protection. Visual LED indicator help to easy monitor the working status and understand battery conditions. Painstaking ETFE workmanship, lightweight and easy to carry. Come with 3-pcs SAE cable kitsfor ring terminals, alligator clips, and cigarette lighters, plug and play, easy to use. No electricity cost, no additional maintenance, totally environment friendly. Product Specification Rated Power Output: 20W Power Tolerance: ±5% Operating Power Voltage: 18V Operating Power Current: 1.1A Open Circuit Voltage(Voc): 21.6V Short Circuit Current(Isc): 1.19A Trickle Charging Current: 0.2A Floating Charging Voltage: 13.8V Overcharge Protection Voltage: 14.4V