Digital Battery Meter (MK-BM-1D)Monitors voltage level and "state of charge" of any 12-volt batteryLCD displayCompact frame for easy storageLED’s indicate, 2\/3, 1\/3 or O "state of charge."WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.