You can get a Sentry G3 siren controller for $1900. Then all you need is a radio with DTMF or Two Tone Sequential capabilities. Or a Genave RXC-2000 for only $1,292.. http://www.genave.com/rxc-2000_prod.htm They can even act as a siren controller, to use steady, wail, and fast wail. Not a bad price...