Review on Herdio 4 Inches Marine Box Bluetooth Speakers - Powerful 100 Watt Waterproof Stereo Sound System for Boats, Golf Carts, Jeeps, ATVs, Trucks, and More! by Steve Snyder

Used on a small sailboat and they are louder than expected.The boat is equipped with an electric motor so the noise from the engine is not competitive.There is a short beep when they turn on and when a Bluetooth device connects or goes out of range.Overall very satisfied .I didn't score 5 stars because I wish the Bluetooth device was built into the speaker body.This is not a weather rating, I had to take extra steps to ensure the device didn't get wet.