PKCELL 9V Battery, Block 6F22 Batteries for Smoke Detector, Radio...
Manufacturer : PKCELL. Item model number : 6F22. Batteries : 2 9V batteries required. (included). Number of batteries: 2 9V batteries required. Service life: the storage life of the batteries is 3 years at 20℃ ± 2℃ and RH 60±15%.