0ur opinion: :SCl-MT4100 GPS tracking system features a robust all inclusive GPS logging system. You have chosen a sophisticated GPS system that is easy to operate.The MT4100 uses GPS to find its location. ln order to lock onto the location, the GPS unit can have a direct line of sight to 3 locations in the sky and these locations are changing constantly throughout the day.
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* Great Gadget with a few issues ...
I bought one of these to keep track of teenager and his new car. I also use it to archive my travels as I am self-employeed and may have a need to prove to the IRS or a client my mileage.
Pros:
1. Profile - very small for what it does and the black color is perfect for concealment.
2. Ease of Use - Simply find something magnetic to stick it to and you're done. Later, retrieve the unit, plug it into your computer, download and view.
3. Accurate - This thing doesn't skip a beat. I've had virtually no blank spots on the tracking. It also records fastest speed and how long you are idle.
4. Cost - good price for the capabilities.
Cons:
1. Software - The software that came with mine would not install. This is not an isolated issue I later found out. I had to download the software from the Internet. Annoying, but I got it to work.
2. Quality - Within 2 months I had lost the cap protecting the USB connection (got lose and fell off). Also, two of the parts that hold the screws in are coming out and need to be glued. The o-ring is also very flimsy and will soon break I am sure.
Overall I like the product and would consider another.
These are great to keep tabs on teenage drivers. You know if they are really going to school, work, friends, etc., how fast they drive and how long they were parked.
Cheep piece of mind.
These would also be great to put on company vehicles to track employees or a suspected cheating spouse!
Buyer's feedback: 
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Really worked well
I was really pleased with how the tracker key worked! I was able to track the vehicle to the precise location using Google Earth.