GEREE Waterproof DC 12V 24V 36V 48V 60V 72V 84V 96V Acid lead/Lithium polymer/Lithium iron phosphate/NiMH Battery Capacity Indicator DC12V-96V Digital LED Tester Voltmeter Monitor Geree lead acid battery Guarantee -- 12 Month Replacement Warranty -- Lifetime Support Guarantee Capacity digital LED Tester voltmeter , Black wire connect to negative, red to positive With a shell, easy to use stand-alone or embedded in the panel on the product. Display Mode:Battery +voltage,Battery +Percentage. Note: This tester for Lithium and lead-acid batteries Universal ,the factory default setting for 24V lead-acid battery power and voltage cycle display,If you need to test other specifications can be re-set by yourself.