With PowerCheck. No alkaline battery lasts longer (On average across devices). Hi-density core. Check power level instantly. 5-year guarantee in storage. Duralock Power Preserve technology. Trusted everywhere. Customer Service Number: 1-800-551-2355 (9:00 AM-5:00 PM EST). Printed on recycled paperboard. No mercury added. www.duracell.com. www.pg.com. Made in USA of foreign and domestic materials.