The 4-Bay Rechargeable Battery Charger is a gem of a charger. It's the most compact little charger that fits anywhere, and more advanced than most chargers you will find on the market. This charger will recharge 4 AA Batteries, 4 AAA Batteries or any combination of the two. Comes with LED Display which indicates when batteries are charged, and has a quick 5 hour charge cycle for both AA and AAA Batteries. Easy color indicator makes it simple to see when the batteries are fully charged.