The Lubell Labs System 3400 is a high power underwater sound system designed to reproduce voice, music, and broadband audio in the pool, lake, or ocean. The System 3400 can be connected to standard 12V marine electrical system, or connected directly to a 12V battery. The mixer/amplifier features two microphone inputs and volume controls, an auxiliary input, and includes a noise-cancelling microphone with locking PTT switch.