3V. DL2025/CR2025. DL202B. Duralock Power Reserve. Contains batteries from foreign countries marked on battery. Perchlorate material - special handling may apply, see www.dtsc.ca.gov/hazardouswaste/perchlorate. Customer Service Number: 1-800-551-2355 (9:00 am-5:00 pm EST). www.duracell.com.