... Standalone 2. Hush Feature Standalone Ionized Smoke Alarm with Hush Feature ( security product, fire alarm) 1.Ionization Sensor for fast flaming2.Insects Proof3 ... .Low-battery and battery missing warning indicator9.Auto-reset when smoke clears10.CE, BSI, TUV, SAI Global approved, comply with EN14604 ... Smoke0.61 ~ 1.92 %/FT.OBS.Product Weight162g DC OperateIonization Smoke Alarm with CE Approved