1、Voltage Range: Multifunctional battery capacity indicator, the monitoring voltage range is 8‑63V, suitable for lithium batteries, acid batteries, etc. 2、Right Setting Key: The battery tester right key can be used to toggle the voltage meter, battery percentage and turn off the battery tester. 3、Left Setting Key: The left key can be used to cycle voltmeter and battery percentage, turn on backlight, set sleep mode, select battery type, etc. 4、Easy Connection: This battery capacity meter is small and compact, easy to connect and use, with reverse connection protection to prevent burnout. 5、Waterproof Shell: The voltage indicator shell is made of PC, with waterproof surface, good toughness, wear resistance and corrosion resistance.