Rechargeable nickel cadmium packs the life of hundreds of alkaline batteries. Closes securely with flip top. LED light lets you know it's charging. Charges from either a 110-volt wall outlet, 12-volt automotive battery, or a USB with the proper adapter. Works with Hot-Shot® 110V Charger Adapter (Item No. R110, sold separately), the Hot-Shot® 12V Charger Adapter (Item No. R12, sold separately) and the Hot-Shot® USB Charger Adapter (Item No. RUSBHSUS, sold separately).