MN1400RT8. 1.5 V. Duralock Power Preserve. Guaranteed for 10 years in storage. Easy to open and store. www.duracell.com. No mercury added. 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. Made in USA.