TURTLE BOX

The boater on your gift list will love this, the Bluetooth speaker to end them all, playing at 120 dB. It can link one to another or several others, and have them all play in sync. Its powerful amp, directional 6-by-9-inch woofer, and 1-inch tweeter belt out music for 20 hours on its five-stage lithium battery. The manufacturer says its outdoor sound curve is designed to carry music at high volume without breaking down. $299; turtleboxaudio.com