FOSA Portable Mini Speaker with 3.5mm Aux Input

The FOSA Portable Mini Speaker is a compact, wired travel speaker with a retractable resonance chamber, 3.5mm aux input, and a built-in rechargeable battery for music on the go.

Small but engineered for punch, this FOSA mini speaker connects via a 3.5mm jack to phones, laptops, MP3 players and other devices, while its USB cable handles charging. The speaker’s expandable resonance chamber boosts low frequencies for a fuller listening experience than its size suggests, and integrated cables mean you won’t need to hunt for extras when you travel. With a tiny footprint—about 5 cm long—and a rechargeable 180 mAh battery, it’s designed for short sessions of louder playback or long stretches at low volume.

How loud and long will playback last on a single charge?

Battery life varies with listening level. At maximum volume the built-in 180 mAh battery provides roughly an hour and a half of playtime, while at very low volume it can last dramatically longer.

• Built-in 180 mAh rechargeable battery.
• Approx. 1.5 hours at full volume; up to about 50 hours at minimal volume.
• Charges via included USB cable for convenient top-ups.

What devices can I use this speaker with?

The FOSA mini speaker accepts a standard 3.5mm audio input, making it compatible with a wide range of electronics. Use it with smartphones, tablet computers, laptops, MP3/MP4 players and most audio sources that have a headphone jack or line-out.

• 3.5mm aux input for universal wired connection.
• Works with PCs, phones, portable music players and many tablets.
• Comes with an attached audio cable and separate USB charging cable.

What does the retractable resonance chamber do for sound?

The speaker features an expandable resonance chamber that changes acoustic interaction inside the housing. When extended, internal reflections strengthen low-frequency response so bass notes sound fuller than typical speakers of this size.

• Retractable chamber increases internal air volume for deeper bass.
• Quickly toggles between compact carry and improved sound mode.
• Designed to enhance perceived loudness and warmth without extra power.

Is the speaker easy to carry and use while traveling?

Yes—its compact dimensions and simple wired setup make it ideal for travel. Everything you need is included and the speaker stores neatly in a bag or pocket when collapsed.

• Approximately 5 cm (2 inches) in length—very portable.
• Includes built-in audio cable and a USB charging cable for convenience.
• Low weight and durable design suited to indoor and outdoor use.

Who is this for: The FOSA Portable Mini Speaker is aimed at commuters, travelers, and anyone wanting a tiny, plug-and-play speaker for casual listening. It’s excellent for bedroom desks, travel bags, or backing up laptop sound for web calls and media. If you need a powerful hi-fi system, this isn’t that—but if you want a pocket-sized, rechargeable speaker that improves bass with an expandable chamber and works with almost any 3.5mm device, it’s a clever, budget-friendly choice.