Retevis RM21 Handheld Marine Radio - Clear, Waterproof VHF

In this review of the Retevis RM21 handheld marine radio, the bottom line is simple: it is aimed at boaters and watersports users who need a rugged, clear-voice VHF for communication and safety. The RM21 stands out for its effective AI-based noise cancelling microphone and IP67 waterproof, floating design, making it a sensible choice for day sailors, fishing boats, and anyone who spends time near jet skis or surf kayaks. The most compelling reason to buy is reliable audible communications in noisy, wet environments where clarity and survival-ready features matter.

Key Features

• AI intelligent noise cancelling mic: digital signal processing recognizes human voice and reduces background noise by about 20 dB so conversations come through clearly even in engine or wind noise.
• HI/MI/LO power switch: selectable transmit power lets users choose long-range, medium-range, or short-range communication to save battery or extend reach depending on where they are on the water.
• IP67 waterproof and floating: the radio floats and has fallen-overboard detection that flashes a red light when charging contacts meet water, improving recoverability and safety.
• Long battery life: a high-capacity 1800mAh Lithium-ion battery offers about 10 hours of continuous use and up to 60 hours standby in battery saving mode for multi-day outings.
• Backlit LCD display: multiple 0-7 background color options improve readability in various light conditions so the screen is easier to use at night or in bright sun.
• NOAA and international channels: coverage includes 10 NOAA weather channels, 88 US/CA/International channels, and triple watch for emergency channel monitoring to help stay informed and reach help.

Who It's For

The RM21 is best for recreational boaters, anglers, and small craft operators who need dependable short-range VHF communications and want a waterproof, floatable radio with strong noise filtering. Its features suit people who encounter engine noise, wind, or nearby high-decibel craft like jet skis and need clear voice reception.

Those who should look elsewhere include mariners who require certified commercial-grade radios with DSC or integrated AIS, and users who need an extremely compact or ultra-lightpack radio for extended backpacking trips where weight is the prime concern.

Pros & Cons

Pros

• Very effective noise reduction for clearer incoming and outgoing audio in noisy situations.
• Waterproof IP67 rating with floating function and fallen-overboard detection improves safety and recoverability.
• Long battery life that handles full days on the water without constant charging.
• Backlit display and wide channel coverage including NOAA weather channels are handy for navigation and safety.

Cons

• Not a substitute for full commercial or DSC-equipped marine radios if advanced features are required.
• Large enough that users seeking the smallest possible handheld may prefer a smaller form factor.

Specifications

Product type	Handheld marine two-way radio
Battery	1800mAh Lithium-ion
Waterproof rating	IP67; floats on water
Noise cancelling	AI intelligent noise cancelling mic (~20 dB reduction)
Channels	88 US/CA/International channels; 10 NOAA weather channels
Display	Backlit LCD with 0-7 background color options
Emergency features	Triple watch mode and quick access to channel 16/9

Our Verdict

The Retevis RM21 is a practical, value-focused marine handheld radio for recreational boaters who need robust waterproofing, long battery life, and very good noise reduction for clear voice communication. It covers NOAA and international channels, floats if dropped overboard, and delivers more than enough range and features for fishing, day sailing, and watersports without the cost or complexity of commercial systems.

Frequently Asked Questions

Does the RM21 float if dropped overboard?
The radio supports a floating function and will remain on the water surface; it also has a red light alert when charging contacts and a detection button contact the water.

How long does the battery last?
The included 1800mAh battery provides about 10 hours of continuous use and up to 60 hours standby in battery saving mode.

Can it receive weather alerts?
Yes, the RM21 includes 10 NOAA weather channels and can sound alarms for severe weather updates.