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).

ASIN	B09TRZZJSH
Best Sellers Rank	#80,874 in Electronics ( See Top 100 in Electronics ) #106 in Marine Electronics
Department	Unisex-Adult
Item model number	MGR300B
Manufacturer	BOSS Audio Systems
Product Dimensions	9.47 x 11.51 x 11.51 cm; 607.81 g

BOSS Audio Systems MGR300B Marine Boat Stereo Gauge Receiver - Bluetooth, No CD DVD Player, AM/FM Radio, IPX5 Weatherproof, USB, MP3

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