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For over 30 years Protech has provided military, government, and commercial users the highest standard in intrusion sensors.
In 1980, a technological breakthrough in microwave signal processing, termed Stereo Doppler, was developed. This technology was the basis for Protech’s high security motion sensor design. Protech now utilizes this proprietary dual-channel microwave design in all of its motion detector intrusion sensor products. Stereo Doppler technology is the key to Protech's commercial motion sensors unique false alarm immunity.
Here's a device that does what it says. I've been able to hear the alerting transmitter as far away as six miles.
This unit operates on MURS channels which are in the VHF spectrum between
151.82 mhz and 154.6 mhz, respectfully.
This means that this unit is also fully compatible with the Dakota MURS intercom system.
I have both and have units in my Shop, Barn and House.
I am able to hear an alert on all three and intercom as well.
Originally posted by AnonymousCitizen
reply to post by Gazrok
I bought a set of these. I've only had it up for for about 6 months now, but it's performing well at about 1/4 mile. It broadcasts on common (MURS) frequencies, so I can hear it on my portable radios as well.
edit on 5/1/13 by AnonymousCitizen because: (no reason given)
Several friends have bought el cheapo units & none of them have been satisfied with them.