FOR CHARGING RECHARABLE BATTERY PACK (Item No. RBP3, sold separately) USE MULTIPLE PACKS FOR CONTINUOUS USE - Use multiple battery packs for continuous use of your Duraprod product. COMPATIBLE WITH HOT-SHOT RECHARGEABLE PRODS - For use with Hot-Shot Rechargeable Livestock Prods. FAST CHARGING WITH INDICATOR LIGHTS - This charging base recharges Duraprod batteries quickly, for less downtime and has easy to read charge indicator display. SMART CHARGING - The charging base has a safety timer stops charging when battery charge is complete.