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These special alkaline batteries last up to 50% longer even when used with today's demanding high-tech devices. Use with PDAs, palm top computers, cameras, minidisc players, handheld televisions, telephones, camcorders and remote control toys.
I do sound therapy and use the Duracell Ultra AAAA Batteries in a small portable headphone amplifier. I am pleasantly surprised at the excellent lifespan of these little batteries and very pleased with this product as well as the price at which I could purchase it through Well.ca.