The Energizer CRV3 Lithium Photo Batteries come in a pack of 2 units, with each battery having a voltage of 3V. These single-use batteries are compact and reliable, perfect for powering various consumer electronics and devices. With an expiration date of 2029, you can be assured that these batteries will provide consistent performance for a long time. The lithium chemical composition ensures a long-lasting power source, making them a practical choice for everyday use.