EG&G Sea-Link Acoustic Transponders, Model 745004 (SN: 001003+). Max. Depth 900 meters. Max Static Load 1100 kg. Xponder Interrogate: 11.0 khz. Xponder Reply: Factory set 3 selectable reply frequencies from 8.0-9.5 to 12.5-14.0 khz in 0.5 khz increments.
This item was pulled from a working environment and appears to be in good condition. No manual or peripherals are included.