Aquatic AV’s Waterproof Transducer Two presents a big step-up in power; with 50 Watt total power it can turn any surface into an effective audio speaker. Waterproof and built to withstand a variety of conditions that traditional equipment cannot, this makes a great transducer for boat or replacement spa speaker. The waterproof transducer two is an effective and economic choice to give your spa or other environment the perfect vibrations. Please Note: The mounting bracket sold separately.