The Pyle PDWR40B is a pair of 5.25"" waterproof indoor/outdoor speakers designed for high-quality sound in wet environments such as boats, patios, and poolside. With a maximum power output of 400W and a frequency response of 40Hz - 22kHz, these speakers deliver rich bass and clear high frequencies. The speakers feature a 5.25"" aluminum injection cone woofer and a 1"" high compliance Mylar tweeter. The system includes a capacitor crossover network to separate bass and treble, and the bass reflex vent enhances low-end performance. These speakers also come with a rustproof, removable mesh grill for easy maintenance.