Subsonus Tag is a battery-powered acoustic positioning transponder that operates with the Subsonus USBL.

Main specifications:

• Position Accuracy 0.25 m
• Range 1,000 m
• Depth Rating 2,000 m
• Battery Life 18 months

Subsonus Tag is a low-cost acoustic positioning transponder that operates with the Subsonus USBL. It features an integrated battery, wireless charging, and a pressure tolerant display. Ultra-low-power consumption allows operation for up to 18 months on one charge. Up to 65,000 Tag underwater transponders can be tracked by one surface Subsonus unit.

Main specifications and features at https://www.advancednavigation.com/acoustic-navigation/transponders/subsonus-tag/