This volt meter has been designed to allow you an easy way to monitor the battery's charge condition by digital read out. This volt meter is designed with a colour graph around the outer edge of the meter. The colour graph makes it easier to monitor the condition of the Lithium battery. Usually monitoring Lithium batteries with a volt meter is very difficult, as a small change is a larger change in the battery capacity of a lithium. See estimated voltages below for a lithium battery reading: 13.4 Volt = 100% 13.2 Volt = 70% 13.0 Volt = 30% 12.0 Volt = 10% The Colour graph around the outer rim of the gauge is designed to stay illuminated GREEN when the lithium battery capacity is above 50%. The graph will then illuminate ORANGE from approx 50% - 30% of battery capacity. The push button allows for the volt meter to switch ON / OFF when desired. Once pushed, the button will 'hold in' until pressed again to release and turn off the gauge. The volt meter is pre-wired to 3mt of 2mm twin core cable. * It is advised to install an in line fuse in any line that feeds off a battery connection (recommended 3-5 Amp fuse) Item specifications: Part No. CBV-L Voltage 9 - 33 Volts Dimensions: L 109mm x H 55mm W 30mm (35mm incl push button) Cable Gauge 2mm automotive twin core Cable length 3mt Approx Power usage 3-4ma Warranty 12 months