Battery Hi/Lo Adj Voltage Alarm

Cuter 'n snot and it isn't some Dyson Vacuum Cleaner design quirk. http://www.ebay.com/itm/NEW-DC-VOLTAGE-MONITOR-MCKAIG-7130DC-7130DC-3-FOR-BATTERY-AND-CHARGER-WITH-ALARM-/141541555543?hash=item20...