sirens are available but to be honest are not really a deterrent to would be light fingered gits I appreciate the miniaturisation of the product and making them battery powered but I would like to see a few settings within the device to allow longer siren times a larger casing and the inclusion of a flashing strobe are these something in the pipeline for an improved siren and better customer satisfaction and a more desirable product please remember without customers you have no buisness and alarms need visible and loud sirens that can be configured to customers requirements.