This Is A Single Pack Of 1 9 Volt, Genuine Pansonic Brand Battery. This Is A Carbon Zinc Type Of Battery, Suitable For Toys, Smoke Alarms, Cordless Micophones, And Many Other Items. It's Always A Good Idea To Stock Up On Batteries For The Holidays, Or For Emergencies. Super Heavy Duty Individual Pack Carbon Zinc Battery Genuine Panasonic Brand Superior Quality