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Weatherproof Preamp / Headphone Amp Weatherproof preamp / headphone amp for H2a (also works with H2a-XLR with adapter and electret microphones. Special pricing for H2 hydrophone buyers and owners:  only $95.00 Unit Price: $125.00

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Rolls MP13 Mini Mic Preamp Preamp for H2a or H2a-XLR Unit Price: $70.00

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Rolls MX34 LiveMix Preamp / mixer Portable mic / hydrophone preamp, mixer and headphone amp Unit Price: $109.00

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Honeytone Amplified Speaker Amplified speaker for use with H1a Unit Price: $25.00