1.5V. Ready to use for up to 10 yrs (when not in use). Lasts up to 3x longer (vs Eveready carbon zinc in toys). Guarantee: We will repair or replace, at our option, any device damaged by these Eveready batteries. Guarantee void if batteries are charged by user or device. Contact 1 888 706-4100. Dispose of properly. www.eveready.com. Made in Indonesia.