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Aquarian Audio provides rugged, sensitive, and affordable hydrophones for general listening applications, including ecotourism, audio and video recording projects, leak detection, and sensor applications in industry and science. We attempt to stock the following items for quick shipment--often same day, or next-business day. If we are not able to ship your order within two business days, we will contact you with an expected ship date. If you require time-critical express shipment, please contact us for verification.