Charger powers up four batteries at a time in four charging channels for efficiency. It quickly charges overnight so you can have fresh batteries in the morning. LED charge indication and overcharge protection allow easy use and battery life optimization. You can charge any AA/AAA NiMH/NiCD battery in 8 hours to reduce waste and save money. You're keeping disposable batteries out of the landfills and saving hundreds of dollars when you use rechargeable batteries vs. alkaline. Simply insert batteries, fold out plug and plug into your wall socket. Charger includes two AA and two AAA Rayovac pre-charged, rechargeable batteries.