The Icom HM-205RB is a heavy-duty, IPX8 waterproof remote hand speaker microphone manufactured by Icom Inc. in Japan. Designed as a direct rear-panel microphone solution or secondary station microphone for high-spec fixed-mount marine VHF transceivers (such as the IC-M506 rear-mic version, IC-M605 series, and IC-M510 series), the HM-205RB provides rugged ergonomics, crisp audio delivery, and convenient radio channel management directly from the handset.

Equipped with an integrated 45mm high-efficiency speaker driver, the microphone delivers clear, high-decibel audio intelligibility over noisy engine rooms and open deck environments. The panel includes quick-access channel Up/Down buttons, a High/Low RF transmit power toggle key, an instant Channel 16/Call channel key (16/C), and an ergonomic side-mounted Push-to-Talk (PTT) switch. Fitted with a heavy-duty coiled cord and an 8-pin waterproof threaded rear connector, it ensures dependable operation under full saltwater spray exposure.

Key Features:
• Heavy-Duty IPX8 Waterproofing: Built to withstand harsh marine environments and continuous submersion without operational degradation.
• Comprehensive Radio Control Keys: Features front-mounted Channel Up/Down keys, Transmit Power High/Low key, and direct 16/Call shortcut button.
• Integrated ⌀45mm High-Output Speaker: Delivers crisp, high-volume audio reception directly from the microphone body.
• Rear 8-Pin Waterproof Connector: Specifically engineered for transceivers utilizing rear-panel microphone input ports or remote junction boxes.
• Ergonomic Coiled Cable: Durable coiled cable expands up to 430 mm (16.9 in) with heavy-duty strain relief for active bridge environments.