Smoke alarm.Test Button,AC120-230V with 9V battery operated,85dB/m,sound and flash,Low battery warning. Test by hand,Dual sensor,Low ... voltage: AC120V or AC230V,9V Backup BatteryStatic current: ≤10uA Alarm current: ≤15mA Fixed Alarm indication: red LED flash Sound level: ≥85dB/m ... % RH Sensitivity:2.06%/ft Detecting area: 20 square meters Alarm output: sound and flash alarm Size: 128 x 38mm deep