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.
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Headphones in the package. Photos without packaging are taken exactly the same headphones.
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Attention. These AquaSonos underwater headphones are sold only on Ebay.
If you see them for sale elsewhere, they are scammers.
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