100 Amp 6V engine start , 200 Amp 12V engine start , Recharge Time (hours at amps) 3-5 at 10, 1-1 1/2 at 40, Trickle Recharge Time (hours at amps) 2-12 at 2, Fan-cooled unit has tester for analyzing electrical and starting system problems Timer switch with hold position , Voltmeter for battery testing , UL rated; CUL listed