Displays the percentage of charge remaining from a single 12V battery (or dual 12V/12V, 12V/24V or 12V/36V systems). Made for RV’s so it comes with a ‘Smart-Set’ feature that adapts to different battery voltages. The LCD rotates between battery one and battery two. One battery (as in, your bike) displays a steady readout. Mounts anywhere. 2"×2.1"×.75", .5 oz.