Xtreme Research Skyscan Lightning/Storm Detector

I bought this model about thirteen years ago for almost $300 and it is still going strong (weather is a hobby).

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Powered by two 9V batteries (not includedd); automatic shut-off after five hours of continuous operation
Rugged ABS plastic
Detect the presence of lightning/thunderstorm activity occurring within 40 miles of your location
Severe Thunderstorm Alarm and emits a distinctive 15 second continuous audible tone different from the detection of normal lightning activity
accurate to within 1 to 2 miles 97 percent of the time

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