Our most advanced alkaline battery (based on high density and powercheck). Guaranteed 5 years in storage. Check power level instantly. Guarantee: If not completely satisfied with this alkaline battery product, call 1-800-551-2355 (9:00 AM-5:00 PM EST). Duracell guarantees these batteries against defects in materials and workmanship. Should any device be damaged due to a battery defect, we will repair or replace it at our option. Contains batteries from US or foreign countries as marked on battery. www.duracell.com.