This product review was a walk in the park... actually a walk around the yard, testing the effective range of this rugged & versatile motion detector & programmable alarm system. The radio transponder motion detecting sensors easily covered the furthest reaches of my property, sending notice when movement was detected.
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Guardline, a major name in home security systems, has answered the call for a motion detector system with greater range & greater expandability, & has done so in a practical, affordable way.
Operating in the UHF 900 Mhz. radio band, Guardline's sensors lie in wait to detect movement. Each censor able to be set up with different sensitivity, detected rate of movement, as well as scheduled time of operation. You can configure each one to match it's location & need of coverage. With up to quarter mile range to the receiver, a sensor can alert you of movement, several minutes before anything could come close.
My one hitch in the review was all by my doing. The sensor's case is held together by four small brass screws, and I of course promptly dropped one as soon as I went to put batteries in the unit. I quickly found the dropped screw, but word to the wise, be careful with opening the sensors.
The number of batteries you invest in may be a burden if you have as many sensors the GL-5000 can handle...(16 units x 4 AA batteries each = 64 batteries), but rechargeable batteries are available which can minimize the burden. And if you're like me, a solar powered charging system can easily be put together which can keep things topped off indefinitely. The upside is how the sensors can be programmed to "sleep" for set periods of the day or night, cutting down on battery use. The GL-5000 doesn't come with connections to a computer or internet, however that's another thing a whiz-kid tinkerer could figure out.
That all said, if you're looking for a reliable, expandable & affordable way to guard for intruders Guardline's GL-5000 system is more than capable. For Home Security I give it a big Thumb's Up!