The challenge in connecting a hard-wired siren to self-contained panels such as the Simon XTi and Simon XT systems is that both of these systems are limited to 250mA auxiliary output. We have found this small size – but very loud siren that can be connected directly to the Simon XT and XTi panel’s output terminals with no additional power supply and relay. This siren uses new patented piezo technology to achieve the same high sound output levels as conventional sirens using only a fraction of the current draw. This reduces the power requirement from the control panel and the standby battery. Installers will also prefer the much lower weight of the new sirens, making installation easier. Size: Approximately 5.25” in diameter. See document below for more details.