A pack of 2 Energizer 9V batteries. World's 1st Zero Mercury 9V Alkaline Battery: Energizer is a leader in the industry in powering people's lives responsibly. Energize's proprietary Power Seal Technology is assurance that you'll have power you can rely on, whether you're capturing baby's first steps, competing in the final level of a video game marathon, or preparing for a storm on the horizon. A 10 year shelf life means that you can be confident that your Energizer 9V batteries always have power when you need it most. That's positive energy!