>> yes. the company manufacturers these beacons for the global market or voice and data recorders for aviation as well as submarine application. you're exactly right in terms of installation. the way these devices operate, they are designed to automatically begin emmii'm emi ping at 37.5 kilohertz, one ping per second, when they are immersed in water. that ping will continue until the device is recovered for a period of 30 days. possibly a bit more depending on the condition and age of the battery. and that is what authorities are hopefully listening and hearing in this situation. >> so it's fascinating about what we're hearing from the chinese news agency is that this chinese vessel, unbeknownst to anyone else had this equipment on its ship and it just happened