Hand Held DC System Tester. At-a-glance testing of batteries, on-board charger, alternator / regulator output. 6 Easy to read LED Indicators. Compact lightweight design. 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.This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.