Specifications Smoke Sensitivity: 0.086 dB/m to 0.14 dB/m Power Supply: 9V Carbon Zinc/Alkaline/Lithium Batttery Battery Life: >12months Low battery life: >30days Alarm indicator: continuously emitting red light and shounder Alarm sound level: >85dB at 10 feet (3m) Temperature: 0℃ - 50℃ Humidity: 10%-90%RH, no condensation or icing Dimensions (L x W x H): Ø107x35 mm