1.5V. With ready power. Now 10 year power (in storage) guarantee. Lasts as long as Duracell. Facebook: facebook.com/rayovac. www.rayovac.com. Rayovac's most advanced technology. Holds power for up to 10 years in storage. Alkaline is ideal for long lasting power in everyday devices. Money back guarantee. Contact 1-800-891-6091; www.rayovac.com for more details. Restrictions apply. Send prepaid postage, the used batteries, original packaging and receipt. Limit one per household. Recyclable card. Made in the USA.