A teen is under arrest after authorities say he tried to rob a man of his car - and other things - but couldn't carry through with it because he didn't know how to drive the vehicle.

The Jefferson County Sheriff's Office on Wednesday announced formal charges against 17-year-old Quinderris Brown. He is charged as an adult with first-degree robbery.

The holdup happened on Aug. 18. Deputies about 4:30 p.m. that day responded to the 2300 block of Fourth Street N.W. to investigate a report of a robbery. Chief Deputy Randy Christian said the 23-year-old victim told authorities he had been doing door-to-door sales in the area of Seventh Street N.W. and was sitting in his vehicle to eat and complete paperwork.

As he did so, he said a black male suspect came up to the window and pointed a handgun at him. The suspect - later identified as Brown - demanded his phone, tablet and car keys.

The victim complied and Brown tried to drive away in the car. The suspect, however, was unable to operate a car with a manual transmission. He left the tablet and the keys in the car and fled on foot.

Christian said the victim was able to track his mobile phone and provide deputies with the location. Deputies located the suspect at an apartment on Tamera Trail, and took him into custody.

He was questioned by detectives and admitted his role in the robbery. He is out of jail on bond. No court date has yet been set.