The Duracell Rechargeable Quick Charger makes it easy for you to keep your devices powered. It works with both AAA and AA NiMH power cells from any manufacturer. This Duracell rechargeable charger gets batteries ready in as little as one hour. You get a pair of AAs in this unit to get you started. The charger automatically turns off when the batteries are finished to prevent overcharging. Using this unit saves you from buying more batteries. Keep a pair inside at all times so you can have some ready whenever your devices run out of energy.