Boss Audio Systems BRT34A: The BRT34A is a 4" amplified sound bar with built-in Bluetooth connectivity and a dome light. It features a Class D amplifier for powerful sound and a compact design for easy installation on your vehicle's rollbar. With its Bluetooth capabilities, you can easily stream music from your smartphone or other Bluetooth-enabled devices. The built-in RGB illumination adds a stylish touch to your vehicle's interior and can be controlled with the included remote control.