Battery Monitor Bluetooth KH160F DC 120V 600A Battery Tester Voltage Current VA Battery Power Meter Capacity Indicator RV Travel ► The display module has a built-in buzzer, and when the device enters protection mode, a remaining power alarm will sound, and a pop-up reminder will appear on the display screen. ► The product automatically recognizes and detects the current in both the charging and discharging directions. Unused item, only tested for operation. Please consider purchasing if you are not overly concerned about home storage conditions.