Guardline 500 Ft. Extra Sensor | Guardline Security

Guardline 500 Ft. Extra Sensor


395 Reviews   |  
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  • Additional sensor compatible with the Guardline Motion Alert. This sensor is NOT compatible with the 1/4 Guardline Motion Alert
  • Add up to 4 sensors per zone (for a total of 16)
  • Sensor has a 40 ft. detection range
  • Weather resistant and ready to withstand the elements
** As with all wireless products the maximum range is determined by the amount of interference between the sensor and receiver. Any obstruction in direct line of sight range will reduce the effectiveness of the signal between the individual units. For maximum distance reduce as much interference as possible.

Customer Reviews

4.5 Based on 395 Reviews
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Dale K.
United States United States

Great Quality

Works great, love it

Margo T.
United States United States


We are hoping for the best, last sensor was # 3 it is ok at this time 1-22-20

Gary D.
United States United States

Guardline sensors

I ended up replacing 2 of the sensors only after one year. Rain ended up in both and ruined them. I have devised a plan to protect the new ones by trimming down a 5 gallon bucket to make large rain shield over the sensors attaching the bucket and sensor to trees. Time will tell if this helps.

Guardline Security

Hey Gary, I'm sorry that has been the case for you. Have you also tried drying out your sensors after moisture gets inside? This can usually resolve any issues you might be having. If you'd like some more tips and tricks on how to best weatherproof your sensor please don't hesitate to reach out by phone at 888-519-0413 or by email at We're always here to help.

Paul J.
United States United States

Great Service

Love the range of tones available. And really appreciate the great customer service. Wish installation and batter replacement could be less time-consuming.

Guardline Security

Hey Paul, thanks for the kind feedback! We work hard to provide our customers with the best possible service. I'm sorry however to hear you had a hard time with installation, if you're working with multiple sensors it can become a bit of an arduous process but we have a few tips and tricks that we'd love to show you to make it a bit more hassle-free. Feel free to contact us at 888-519-0413 or by email at

Jackie N.
United States United States

Just what we needed to monitor long driveway

Guardline was quick and easy to order. Love our monitors and service is great. Would recommend to others.

Guardline Security

Hey Jackie thanks so much for your kind feedback! We are so grateful for your feedback, keep on rockin this system.

Q: I want to use current system as alarm could you specify how wide is the beem,please include the hight and width, also what barier it needs to stop the beam , the space i,m trying to monitor is around 80 ' with posibility of installing two sensors facing outward or each other it will depend the answers i will get.thank you
Answers (1)
A: The beam has a 12 degree field of view left to right, and a very slim vertical margin. The sensor can see at max 40 ft. For your situation, it sounds like you would need two sensors.
Q: I'm interested in the GUARDLINE WIRELESS DRIVEWAY ALARM and would like to know what exactly it means that it can go through walls. Can I place the sensor nearby the window indoor and still be able to detect motions? And how low is the lowest volume?
Answers (1)
A: The signal from the sensor from the receiver can go through walls. The sensor cannot see through windows, as it is an infrared sensor. The sensor will see the window as a solid heat signature and cannot see heat signatures on the other side of the window.
Q: Can it work from 220V output for 12V adapter on receiver?
Answers (1)
A: The Guardline receiver has an input range of 110-240V.
Q: If I mount the sensor at the opening of my garage door will the hot Florida sun set the heat sensor off? It will be used to alarm me when someone enters my garage and my garage faces SSW so it gets really hot.
Answers (1)
A: If the you have a PIR sensor, there is a small chance that it will give off a false alarm from a quick beam of direct sunlight. A good fix for this is to have the sensor pointed in a direction where the sun will not hit the eye directly.
Q: My company is situated on a busy road with a very steep driveway. From the top of the driveway it is impossible to see if somebody is coming up until it's (almost) too late so we are looking to keep any future accidents from occurring. Is it possible to use the sensor at the bottom of the driveway and the receiver at the top in a waterproof box and connected to a light? Or is there possibly a different product that would work better?
Answers (1)
A: As long as you keep the receiver plugged into power and kept in a weatherproof box, then your setup would work. The receiver has to be plugged into power in order to power the 12v light that you plan on running. Please give us a call at 888-519-0413 with any further questions. Devin, Guardline

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