This quality 12 volt 1.2 Amp 2.1mm ID coaxial battery charger for the Razor MX125 Dirt Rocket has a 5.5mm outside diameter and 2.1mm inside diameter and provides an output of 1200 mA (1.2 amps). It features a multi-color LED that indicates when the charging is complete. Note: This battery charger is not compatible with the Razor XLR8R. The XLR8R requires a coaxial charger port with a 2.5mm inside diameter. In addition, the charger is only compatible with scooters or other electric applications equipped with a single 12 volt battery system. It cannot be used to charge multiple 12 volt battery cells simultaneously. LED Indicators: Red - Charging Green - Charged