B-Probe prototype custom underwater pressure housing
designed/built by Cetacean Research Technology

update: the B-Probe was replaced by the Acousonde™ 3A marine acoustic recording tag in 2009.
The dedicated marine mammal version, the Acousonde 3B was released in 2011.

Cetacean Research Technology is the international distributor for the Acousonde 3A and Acousonde 3B.
for more info see: autonomous underwater recording / Acousonde3B