20V MAX FLEXVOLT 12 Amp Fan Cooled Fast Charger - DCB1112. (2) Batteries. Compatible with all 20V MAX and FLEXVOLT batteries. Stage 1 and 2 LED format communicates more to the user about the battery's state of charge. Internal fan pulls air across batteries to cool and reduce hot/cold pack delays. Fan-assisted cooling results in faster charge times and reduced downtime in the field. Through-hole wall mounts. Double insulated design