... DC battery Powered Standalone 2. Hush Feature Standalone Ionized Smoke Alarm with Hush Feature ( smoking, security product,security product) 1. ... .Insects Proof3.Hush/Test button4.High and stable sensitivity5.With quick fix mounting bracket for easy installation6.Fitting and ... smoke clears10.CE, BSI, TUV, SAI Global approved, comply with EN14604, AS3786 and UL217 standard Operation Temperature4°C -38° ...