The Boss Audio Systems MCBK425BA are weatherproof speakers with built-in amplifiers, perfect for outdoor activities like motorcycle or UTV riding. With Bluetooth connectivity, you can stream audio wirelessly from your phone or other Bluetooth-enabled devices. The speakers also feature a 3.5mm audio input for connecting other audio sources. The speakers are easy to install with included mounting hardware and rubber mounting shims. The weatherproof volume control allows you to adjust the volume without having to remove your gloves.