Battery Meter with Alarm Capacity Voltage Monitor DC 12V 24V 36V 48V 60V 72V

This device came without any manual or other instruction information on how to set up the settings. The settings are not self-explanatory. Without doing the setups, it is only good for a voltmeter function without any charge info other than the default which is not the same as a simple car battery, which is why I rated it only 2 stars - it works OK only as a simple voltmeter which reads whatever it is connected to.