Piezoelectric underwater headphones "AquaSonos" with a passive voltage amplifier, for metal detectors. 
Frequency range 40-4000 Hz. 
These earphones are with connector for XP Deus II metal detectors. 

They can stay under water for a long time. 
The depth of immersion is limited by the specific metal detector with which the headphones are used.
------
Headphones in the package. Photos without packaging are taken exactly the same headphones.
------------------------------------------------------------------------------------------
Attention. These AquaSonos underwater headphones are sold only on Ebay. 
If you see them for sale elsewhere, they are scammers.



004