The Lubell Labs System 3400 is a high power underwater Diver Recall System designed for installation and use on commercial dive boats. Divers can be paged via included microphone, or background music can be played by attaching an mp3 player (not included).

The System 3400 can be connected to standard 12 volt marine electrical system via attached pigtail, or connected directly to a 12 volt battery or lighting "brick". The mixer/amplifier features two 6.35 mm microphone inputs / volume controls, an  auxiliary 6.35 mm input, and includes a noise-cancelling microphone with locking PTT switch.

The patented Lubell LL916C underwater speaker is a state-of-the-art piezoelectric underwater acoustic transducer utilizing the Tonpilz design. The advantages to this remarkable design include a broadband response (200 Hz - 20 kHz), high efficiency (60% @ 1kHz), and an output level of 180dB/uPa/m @ 1kHz.

The LL916C is extremely rugged by virtue of it's protective cage. The LL916C operates at all pool depths, and may be used in river, lake, or ocean at depths up to 60'.

Features
500 meter typical diver recall range
Powerful 60 watt mixer/amplifier
Lubell LL916C underwater speaker with protective cage and 25' attached PVC cord for temperate climate use. (For frigid temperatures, order with Subconn bulkhead connector and 50' mating SOOW cable: LL916C-MCBH-50 (+$390).
Convenient 12 volt operation
200 Hz - 20 kHz system response
180dB/uPa/m SPL @ 1 kHz
Hand microphone with locking PTT switch
Extra microphone input for connecting optional wireless mic, guitar, etc.
Auxiliary input (6.35 mm) for connecting line level music or sound source (CD, cassette, function generator, guitar, etc...)
Used by Army, Navy, USMC, Coast Guard, police dive rescue, NASA, and movie production crews.
2 yr ltd warranty amplifier
5 yr ltd warranty on underwater speaker