This 12 Amp Fast Charger has the highest charge rate in the 20V MAX and DeWalt Flexvolt battery range， minimizing downtime on the job. The new Stage 1 and Stage 2 LED (light emitting diode) indicators communicate more about the battery's state of charge than those without. The Stage 1 LED blinks until the battery is approximately 80% charged. It then stays solid and the Stage 2 LED blinks until the battery is fully charged. Internal fan pulls air across battery to cool and reduce hot/cold pack delays. Through-hole wall mounts. Double insulated design. Compatible with all 20V MAX and Flexvolt batteries.