All Nissan Sentra trim levels gain new standard equipment for 2015. Base S models get cruise control, a USB connection port, Bluetooth phone connection, steering wheel audio controls and automatic headlights, while the midgrade SV now has keyless entry and ignition, a color audio display, a rearview camera, Bluetooth audio connectivity, integrated smartphone apps, satellite radio and leather accents. The sporty 2015 Nissan Sentra SR also picks up the keyless ignition, along with heated front seats and heated outside mirrors. Rear disc brakes are now standard on the SR and SL trim levels. Finally, Nissan has modified the Sentra's front structure to improve crash safety and lengthened the side airbags.