Is the light and the time suppose to stay on constantly?

Hello Cade, There are 2 links below which should help to answer your question. The 1st will guide you to a user manual. The 2nd is a link to Boss Support https://bossaudio.com/product/mgr300b/ https://support.bossaudio.com/hc/en-us

Can i just hook it up to my amp, instead of using the head unit outputs?

Hello Tanner, Yes, you can use the pre-amp outputs to connect to your amplifier. Please see the link below for more information. https://bossaudio.com/product/mgr300b/

Besides the volume knob, what’s the difference between this and the boss 350b? There are no reviews anywhere

Hi Dedmon9 The 350b has an RDS Tuner, where the 300b doesn't. ("RDS" stands for "Radio Data System" and it allows FM broadcasters to send far more than just an analog audio signal out over the air waves. Using a 57 kHz "subcarrier," stations can transmit digital RDS data for reception by RDS-equipped FM tuners).

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BOSS Audio Systems MGR300B Bluetooth Marine Stereo Gauge Receiver, No DVD

BOSS Audio Systems MGR300B Bluetooth Marine Stereo Gauge Receiver, No DVD

Product ID: 442830234

Details

Audio Encoding
Windows Media
Audio Output Mode
Stereo
Brand
BOSS Audio
Color
Black
Compatible Devices
Android iPhone
Connectivity Technology
Auxiliary USB

📱Seamless Bluetooth streaming

🔊240W peak power output

🌧️IPX5 water & dust resistant

R5530

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Description

🌊 Ride the sound waves with BOSS — your ultimate marine audio captain!

WEATHERPROOF DURABILITY - IPX5-rated protection means your stereo thrives through splashes, dust, and unpredictable marine conditions.
IMMERSIVE 240 W SOUND POWER - Feel every wave with crystal-clear, room-filling audio that dominates the marine environment.
EFFORTLESS WIRELESS CONTROL - Stream and manage your favorite playlists from Spotify or Pandora directly via Bluetooth—no cables, no hassle.
NIGHT READY ILLUMINATED CONTROLS - Navigate your music effortlessly after sunset with a sleek backlit panel designed for low-light conditions.
UNIVERSAL CONNECTIVITY CHARGING - USB and auxiliary inputs keep your devices powered and your audio library limitless on every voyage.

The BOSS Audio Systems MGR300B is a compact, weatherproof marine stereo receiver delivering 240 watts of power through 4 channels. Featuring Bluetooth connectivity for wireless streaming from smartphones and apps like Spotify and Pandora, it boasts an IPX5 water and dust resistance rating, illuminated controls for night use, and versatile USB and auxiliary inputs. Backed by a 3-year platinum warranty, this marine-grade stereo is engineered for durability and seamless audio performance on the water.

Specifications

ASIN	B09TRZZJSH
Audio Encoding	Windows Media Audio (WMA)
Audio Output Mode	Stereo
Audio Output Type	Speakers
Best Sellers Rank	#21,676 in Electronics ( See Top 100 in Electronics ) #13 in Marine Stereo Receivers
Brand	BOSS Audio Systems
Built-In Media	Mounting kit, rubber cover, instruction manual
Color	Black
Compatible Devices	Android, Smartphone, iPhone
Connectivity Technology	Auxiliary , Bluetooth, USB
Connector Type	RCA
Controller Type	Android, iOS
Customer Reviews	4.5 out of 5 stars 180 Reviews
Format	WMA
Item Dimensions D x W x H	3.73"D x 4.53"W x 4.53"H
Item Type Name	BOSS Audio Systems MGR300B Marine Boat Stereo Sound System Head Unit - No CD Player, Bluetooth Audio, IPX5 Rated, USB, MP3, AM/FM Radio Receiver
Item Weight	1.3 pounds
Manufacturer	BOSS Audio Systems
Mfr Part Number	MGR300B
Model Number	MGR300B
Number of Channels	2
Number of Items	1
Other Special Features of the Product	Built-In Bluetooth
Output Power	240 watts
Output Wattage	240 watts
Software Update Supported to Date	unknown
Special Feature	Built-In Bluetooth
Supported Internet Services	Pandora, Spotify
UPC	791489132534
Unit Count	1 Count
Warranty Description	BOSS Audio Systems provides a powerful 3-year platinum online dealer warranty so long as the purchase is made through Amazon.
Wattage	240 watts
Wireless Technology	AM/FM, Bluetooth

Reviews

J**R

Awesome head unit for a great price

Amazing radio to install for a great price. The sound quality is amazing, great display, and it is super easy to connect to. Has held up for over 3 years now

24.08.2026

I**Z

Plug and play

Plug and play work perfect

22.07.2026

K**E

Great radio

Very nice radio for the price, I installed this in our pontoon boat to replace the original and it has better sound than the original. Plus I like the Bluetooth.

21.08.2026

L**N

Great buy

Works very well, only complaint is I cant turn leds off while turned on.

8.10.2025

K**K

Great head unit

The head unit itself is absolutely amazing it looks beautiful in my boat. Its sounds amazing seems like very nice quality its very simple to use and its just amazing ! But..... I see in the photos of this listing and on the box theres supposed to be a cover mine did not come with one. Ive looked in the box 100 times on the unit itself. The moment ive opened no cover.

19.06.2026

J**S

Good craftsmanship!!

Sounds great and easy to install! Has been on the boat for 3 years now and still working great!

26.12.2025

A**R

Buen stereo

Muy buen estereo buen sonido lo recomiendo

7.07.2026

F**T

What's not mentioned

This little unit is perfect; price, sound and fit and finish. This has a beauty ring where it can be solidly mounted from the front and then the screws can be concealed. What was not mentioned, it comes with a rubber protection cover for when storing.. Sound is very good especially since I am running a four channel amp. The price is just right. The only question will be how long it will last but for the price, it can be replaced very easily.

15.10.2022

L**S

Excelente

Muy buen producto; cumple con lo que promete.

28.11.2024

A**E

Cumple sus funciones y llega rápido 🫡

Es práctico para instalar y no necesitamos gran cosa, cumple sus funciones al cien 😃

13.06.2024

F**S

Decepción

No funciona el radio, trae un corto de fábrica. Y se calienta. Necesito devolverlo para que me lo cambien y no veo opción aquí

15.06.2024

D**.

Falla

Se desconecta del blutooht tocando el estério sin moverle a nada

31.10.2025

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R5530

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

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