Are you looking for a professional, yet alarm? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? , ! Our professional alarm must meet you needs. It is one of the for you. Features - Color: White. - Material: Plastic. - Size: 9 x 9 x 3.5 cm. - Rated voltage: 9V battery (not included). - Static current: <=10uA. - Alarm current: <=70mA. - Sound pressure level: 80dB ( directly in front). - Working temperature: -10 degree centigrade to + 50 degree centigrade. - Relative humidity: <=95% RH (40 degree centigrade &plusmn; 2 degree centigrade). - Independent alarm, helping early of fire, keeping your family safe. - Once the attains the certain density, it can timely send out sound and light alarm to alert and warn people stay far from field. - High sensitivity and stability, accurate . - Loud 80dB alarm sound is powerful enough to alert you when is detected. - Suitable for fire alarm in house, factories, shopping malls, hotels, restaurants, office buildings, markets, schools, libraries, etc. - Equipped with a test button, checking the operating status of alarm at anytime. Package list: 1 x alarm