Will this work on an electric banjo?

Not sure, my son used it for an electric guitar. I would think it would be a standard size.

The product description says "Earphone input jack:3.5mm." Shouldn't it be output jack? Is this a typo?

Yes you are correct, has 1 3.5mm input and 1 output. I didn't notice this in the listing when I bought is a gift. Probably wouldn't have gone over well to give the kid a headphone amp that didn't have an output. Good catch.

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🎸 Pocket-sized power for the modern guitar hero

TRUE TO TONE SOUND - Custom effects deliver authentic lead guitar vibes
SILENT PRACTICE MODE - Headphone output lets you jam without disturbing anyone
SLEEK MINIMALIST DESIGN - Discreet black finish complements your professional style
BATTERY FREE CONVENIENCE - No batteries required—plug in and play instantly
ULTRA PORTABLE POWERHOUSE - Fits in your pocket, practice anywhere without bulk

The JOYO 'Super Lead' JA-03 is a compact, battery-free mini guitar amplifier designed for private practice. With its direct headphone output and custom effects, it delivers authentic lead guitar tones in a sleek, pocket-friendly form factor—perfect for on-the-go musicians who value convenience and sound quality.

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Compatible Devices	Guitar
Color Name	Black
Batteries Included	No
Batteries Required	No
Brand	JOYO
Manufacturer	Joyo Audio
Item Model Number	JA-03 LEAD
Size	フルサイズ
Material	Lead
Product Dimensions	2.54 x 2.54 x 2.54 cm; 54 g
Item Weight	54 Grams

JOYO "Super Lead" Sound Effect Mini Guitar Pocket Amplifier with Headphone JA-03

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