9V Lithium battery. High energy density, up to 5X more than alkaline, up to 10X more than carbon zinc. Up to 10 year shelf life. High running voltage. Lightweight - 18% less than alkaline. Wide operating temperature range. Meets ANSI alkaline 1604 size specifications. Applications - Smoke alarms, carbon-monoxide detectors, wireless security devices, alkaline 9V replacement. Clip strip.