You are able to program this 2004 NISSAN SENTRA keyless entry remote by yourself using the simple programming instructions we send with the remote. They are very easy for the average customer to follow without any automotive experience. If you are having problems with programming a 2004 NISSAN SENTRA , you can call our technical support line for help. This keyless entry remote comes with battery and is tested for functionality before sending. Please make sure that your remote reads CWTWB1U429, and has 4 buttons.