The smoke of initial fire may amassed under the ceiling indoors, the photoelectricity smoke detecting alarm apparatus (below named the alarm apparatus ) can detect the existence of somke in real time, Detection is accomplished by sensing scattered light from minute smoke particles or other aerosols. When detection occurs, a pulsating alarm is sounded via on–chip push–pull drivers and an external piezoelectric transducer.it makes audible and visible alarm after dealt with by electronic circuit, so it can make people know the fire as early as possible and extinguish it in the state of germination

Working Voltage:DC9V（battery supply）

Working current: monitor state less than 12μA, alarm state less than 5mA.

Alarm loudness: distance 3m,loudness not than 85db.

Ambient condition temperature: －10℃～＋60℃

                Relative humidity <=95%(40±2)℃

Protective area:the height of installation for less than six meter, protective area for more than sixty square meter.

Physical dimension: Φ120mm×45mm

Weight:  153g