Ajax Wireless Security Fire Detector "FireProtect", Black//https://ajax.systems/products/fireprotect/Installation method: IndoorsCompatibility: Operates independently or with all Ajax hubs, range extenders, ocBridge Plus, uartBridgeSensing element: Photoelectric and temperature sensorsActivation threshold: +59°С ±2°СType of notification: Sound/lightVolume of built-in siren: 85 dBAlarm signal delivery time: 0.15 sFalse alarm filter: +Interconnected alarms: +Power supply: Battery: Two CR2 batteries, 3 VBackup battery: CR2032Battery life: Up to 4 yearsAdditional temperature sensor: AvailableOperating temperature range: From 0°С to +65°СPermissible humidity: Up to 80%