... smoking, security product,fire sensor) 1.9V DC battery Powered Standalone 2. Hush Feature Standalone Ionized Smoke Alarm with Hush Feature ( ... smoking, security product,security product) 1.Ionization Sensor for fast flaming2. ... -battery and battery missing warning indicator9.Auto-reset when smoke clears10.CE, BSI, TUV, SAI Global approved, ...