The DA-605 Drive-Alert is the newest model in Miefs line of wireless vehicle detection systems. This completely wireless system detects vehicles approaching and sends an alert through plug-in chimes and battery-powered portable chimes.These reliable systems are free from the false alarms attributed to other systems on the market and are easy to install! The DA-605 Drive-Alert gives the purchaser a choice of a DA-068 Plug-in Chime or the DA-070 Battery-powered Portable Chime. The portable chime allows the owner to taKe it up to 100' away (into the backyard, by the pool, or out to an exterior building). Extra chimes may be ordered and used in any combination and quantity. Furthermore, these chimes have volume control and a choice of three different alert tones.The DA-605 Control Panel activates the plug-in and portable chimes through radio frequency (315 mhz).