The Qolsys IQ Siren QS-QZ2300-840 is the perfect way to make your home even LOUDER when the alarm goes off. The IQ Siren is an ultra-loud wireless Z-Wave siren that compliments your IQ Panel's built-in siren. At a whopping 105dB, it's ear-splitting piezo will scare away any intruder and mimics the siren pattern used by the IQ Panel. Completely wireless it plus into any standard outlet and even includes 3 LED lights that strobe during alarm events. The IQ Siren also contains a rechargeable 3 hour backup battery. The QZ2300-840 plugs into any standard outlet and even acts as a repeater to improve the performance of your Z-Wave network. Acting as a Z-Wave repeater, it strengthens and improves your smarthome network improving the performance of all your devices.