World's longest lasting. That's positivenergy. www.energizer.com. Efficient construction maximizes the use of Lithium - same size, more output. Devices perform at their best for longer vs alkaline batteries. Holds power up to 20 years in storage. Lightweight and performs in extreme temperatures (-40 degrees F to 140 degrees F). Questions or comments? 1-800-383-7323. Made in Singapore.