The Duracell CEF14 Rechargeable Charger provides a reliable power solution for both AA and AAA NiMH batteries. Engineered for efficiency, it can charge four AA batteries in as little as 4 hours. An integrated LED status indicator system communicates the charging progress, with a red light for charging, green for complete, and a blinking red light to signal a battery error. Built with multiple safety features, the charger includes an automatic shut-off to prevent overheating and overcharging. Its universal voltage compatibility (100-240V) makes it a convenient choice for travel.