The GC016 X-Connect 12V Dashmount Battery Indicator (M10) Accessory is compatible with G750, G1100, G3500, G7200, and G4 models, as well as, GENIUS1, GENIUS2, GENIUS5, and GENIUS10. It displays the batteries state-of-charge in 25% increments and permanently connects to the battery terminals via M10 (3/8-inch) hole size. Not compatible with NOCO Boost UltraSafe Lithium Jump Starters.