This HC-109 DC Powered Wired Fire Alarm Siren is a perfect addition to your home security system for extended safety protection. It features a compact size that can be easily installed to any place. Once the alarm is triggered￡? it will give out a piercing sound no less than 105dB to alert you of the presence of fire. And it is built with three kinds of tones￡? including 120￡? 110 and 119. You can rest assured to rely on it! Don?ˉt hesitate to get one now!                                    Features             Compact size￡? easy to install to any place<br> Give out a piercing sound no less than 105dB once triggered<br> Alert you of the presence of fire<br> Low power consumption<br> Built with three kinds of tones￡? including 120￡? 110 and 119<br> Solid and durable￡? stable performance <br>                                                            Specifications             Working Voltage     DC 24V / 12 V    <br> Working Current     ?ü75mA / 90mA    <br> Alarm SPL     ?Y110dB / 105dB Tone    <br> Tone of Number0     120    <br> Tone of Number1     110    <br> Tone of Number2     119 Others    <br> Color     Red    <br> Weight     5.5oz / 156g    <br> Material     Plastic    <br> Dimensions     (5.31 x 4.57 x 1.97)" / (13.5 x 11.6 x 5)cm (L x W x H)     <br>                                                             Package Includes            1 x Alarm<br>2 x Screws Pack<br>