The phrase "a tracking device that" is correct and usable in written English.
You can use it when describing a specific type of device that is used to monitor or follow the location of something or someone.
Example: "The company developed a tracking device that can be attached to vehicles for real-time location updates."
Alternatives: "a locator device that" or "a monitoring device that".
The man, Steven Phillips, 50, responded by removing a tracking device that had been strapped to his ankle since December, when he was released from prison on parole.
At an afternoon news conference, Major Ryan said that the plane had a tracking device that can be detected by satellite, but that she did not know whether searchers had learned any information from it.
As on most films, the sound effects in "No Country" can be divided roughly into emphatic (gunshots, the beeps of a tracking device that connects hunter and hunted), and ambient noise (engine hums, the whistling prairie wind).
Those who are at much greater risk of committing a crime might be offered the morality pill; if they refused, they might be required to wear a tracking device that would show where they had been at any given time, so that they would know that if they did commit a crime, they would be detected.
If you had told even the nosiest spook in 1983 that, within 30 years, much of the populace would be carrying around a tracking device that kept a permanent record of everywhere they had ever visited, he'd have thought you mad.
And it's true: the smartphone in your pocket is a tracking device that also happens to allow you to make calls, read email, and tweet.
Applied Digital Solutions of Palm Beach, Fla., plans to demonstrate a prototype later this year of its Digital Angel, a small tracking device that can be implanted under the skin or attached to a wristwatch.
This is an increasingly hot space, given that Sense, a sleep tracking device that measures temperature, humidity and ambient light, raised over $2.4m after aiming for $100,000 on Kickstarter.
Highlights include a satellite tracking device that will allow voyagers to view their own homes from space, a five-billion-year-old meteorite and space training suits.
Sense is a sleep tracking device that measures temperature, humidity and ambient light.
It's basically a little tracking device that hangs off of your kid's clothes and allows you to track them anywhere on Earth.
