A Sanford, Florida, woman is facing charges after authorities said she placed a GPS tracker on her ex-boyfriend's car in order to stalk his every move.

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Investigators said the victim became suspicious after the suspect, Erica Capps, would show up at the homes of friends he was visiting.

He said the stalking lasted two months.

Authorities said Capps’ behavior began to escalate with each surprise visit.

Investigators said it started Sept. 19 when Capps showed up at his friend’s house in Altamonte Springs and texted him to go outside.

When he did, he saw Capps was there and she began an argument for being at his female friend’s home.

The same thing happened when the victim visited another friend’s home on Oct. 18 in Maitland and at a Best Buy in Sanford a couple of weeks later.

Capps also showed up at a Walgreens on Nov. 8, according to an arrest affidavit.

The report said she also sent him screen shots of his location and places he had visited recently to question why he was there.

“That caused him a significant amount of distress and then ultimately he was able to check his vehicle and discovered that a tracking device had actually been put on it,” said Seminole County Sheriff’s Office spokesperson Bob Kealing.

Capps was arrested over the weekend, but has been freed on bond.

Bob Brown of Spy Geeks said the tracking devices are easy to install.

“These are both under my vehicle. Magnetically placed,” he said.

He posted video on his website on how to find a GPS tracker on a car.

He said it's the most commonly asked technology question.

“People buy them for all sorts of reasons, but they’re supposed to track their own car or their kids’ car. That’s legal. Anything else would be illegal,” said Brown.

Brown said using a live tracking unit involved a monthly fee.

Capps will be arraigned on the charges next month.