Buy on Amazon : http://www.amazon.com/gp/product/B001KRX518?tag=lottalatte-20 <br /> <br />SecurityMan SM103 Wireless Indoor Siren for Air-Alarm1 and Air-AlarmII - Silver <br /> <br />Add-on wireless indoor siren for SecurityMan Air-Alarm system <br />Receiving Distance300ft In open area <br />Operating Power 100 to 240VAC <br />Siren Sound 120dB
