The SSM-17H is fully compatible with all the handheld transceivers that have a speaker mic connection. The audio power, quality and design of the SSM-17H are improvements as compared to the MH-57A4B.
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![Standard Horizon Compact Speaker Mic [SSM-17H]](http://www.essentialmarineservices.com/cdn/shop/files/85338XL.jpg?v=1702483030&width=1445)