SMAKN&reg; DC 12v 24V 36V 48V 60V 72V 96V Acid lead batteries percentage capacity indicator LED Tester voltmeter(Default 12v) capacity digital LED Tester voltmeter;Work current:&lt; 5-15mA (with backlight);Energy resolution:1%;Voltmeter accuracy :1%;Using temperature range: -20- 70 Operating humidity:10-80%; External dimension:482921 mm; Hole Dimensions :45.526.5 mm; With a shell, easy to use stand-alone or embedded in the panel on the product.; Display Mode:Battery +voltage,Battery +Percentage Default 12v battery, you can set different voltage batteries