For use as an internal siren when the alarm system goes into full alarm. Connects to existing bell box output on the control panel. (Not to be confused with a internal speaker which will also make tonal noises when a alarm key pad is depressed and entry and exit tones.) Suitable for use on most wired intruder alarm systems including ADE, Honeywell, Texecom, Scantronic, Pyronix, Gardtec, Eurosec and many more, if unsure just ask and we will confirm if it will fit your existing system. Only requires 12 Volt DC to be applied to the red (+) and black (-) wires to activate the siren so could be used for other warning applications. Main Features Twin Piezo Design 104db @ 1 Meter Voltage Range 6 - 12 Volts DC Frequency Range 1.5 - 2.8 Khz Current 85ma Compatible with most.