( CNN ) -- A Florida man charged with murder in the fatal shooting of a teenager amid an argument over loud music at a gas station pleaded not guilty Monday . Michael Dunn , 45 , entered his plea during a hearing Monday morning at the Duval County , Florida , jail . Dunn told investigators he fired at a car in which Jordan Davis , 17 , and three of his friends were sitting because he felt threatened by them . No guns were found inside the teens ' car , the Jacksonville Sheriff 's Office said . The case against Dunn , who has been jailed without bond since the November 26 shooting at the Jacksonville , Florida , gas station , has been compared to the `` stand your ground '' case in which George Zimmerman is charged with killing Trayvon Martin . Similar to Martin , Davis was an African-American teen . Dunn , indicted on a first-degree murder charge last Thursday , is no `` vigilante '' but did feel threatened and shot out of `` self-defense , '' his lawyer said two days after his arrest . `` There are no comparisons to the Trayvon Martin situation , '' said Robin Lemonidis , Dunn 's attorney . `` He is devastated and horrified by the death of the teen . '' Dunn told authorities that he had asked the teens to turn down the blaring music coming from their vehicle , which was parked next to his as he waited for his girlfriend to return to the car . He heard threats from the teens , Dunn told police , and he felt threatened and thought he saw a gun in their car . He grabbed his gun and fired at least eight shots , authorities said . `` It 's about loud music and it 's also about anger , about having a concealed weapon in your car , knowing you have it and feel bold enough to use it because you 're being shielded in the state of Florida , '' Jordan Davis ' father , Ron Davis , told CNN . `` They tell you if you have a concealed weapon , these are some of the things you can do . If you feel you 're threatened in any way , then you are allowed to use your weapon . '' Shooting of Florida teen is no Trayvon Martin case , attorney says . CNN 's John Branch and InSession 's Aletse Mellado contributed to this report .
Michael Dunn entered his plea during a hearing Monday at the Duval County , Florida , jail . Dunn case has been compared to the `` stand your ground '' case involving Trayvon Martin 's death . `` There are no comparisons to the Trayvon Martin situation , '' Dunn 's lawyer says . Dunn said he felt threatened by the teens , but no guns were found inside their car .