How long does the battery really last?

Monster rates it at up to 32 hours. Expect less at high volume, since loud playback drains any battery faster than background listening.

No water-resistance rating is listed, so keep it out of rain and away from pools and splashes.

Can I use it with Siri or Google Assistant?

Yes. It supports both Siri and Google Assistant, so you can trigger your phone's assistant through the speaker.

Yes. NFC is included for quick tap-to-pair with compatible phones, alongside standard Bluetooth.

Can I plug in a wired source?

No aux or other wired input is listed. Bluetooth and NFC are the only connection options.

Is it good for outdoor use?

It is marketed for outdoor use and plays loud, but without a weather rating it is better suited to dry outdoor settings than to beach or poolside use.

Where is the Monster Superstar S320 Bluetooth Speaker cheapest?

At Walmart, for $35.89, 64% off, as of our latest check.

Monster Superstar S320 Bluetooth Speaker

Best price now

$35.89at WalmartChecked 43 min ago

Deal: 64% off at Walmart →

Prices are checked against each store and labelled with when.

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Monster Superstar S320 Bluetooth Speaker

Best price now

$35.89at WalmartChecked 43 min ago

Deal: 64% off at Walmart →

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Lowest price today: $35.89 at Walmart (checked Nov 10, 2026).

Our take on the Monster Superstar S320 Bluetooth Speaker

The Monster Superstar S320 is a large portable Bluetooth speaker rated at 120 W, with NFC pairing and voice-assistant support for Siri and Google Assistant. Its headline claim is up to 32 hours of playback, which is long for a speaker this powerful. It suits people who want loud outdoor sound and multi-day battery rather than a pocket speaker. Against smaller rivals it trades portability for volume and stamina, and it lacks the water-resistance rating and app EQ that many competing outdoor speakers offer.

Best forBackyard and patio partiesCamping and tailgatesBuyers who want loud volumeLong trips away from power

Pros

High 120 W rated output for its class
Up to 32 hours of claimed battery life
NFC tap-to-pair on top of Bluetooth
Works with Siri and Google Assistant
Portable design with a carry-friendly shape

Cons

No water- or dust-resistance rating listed
Large and heavy compared with pocket speakers
No app EQ or sound customization mentioned
No aux or wired input listed

Monster Superstar S320 Bluetooth Speaker prices at every store

WalmartNew
In stockSold by MCT Direct
$35.89Checked 43 min ago
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Monster Superstar S320 Bluetooth Speaker price history

Lowest price we've seen: $35.89 on Nov 11 at Walmart. Tracked across 1 store since Nov 11.

Specifications

Wireless: Yes
Portable: Yes
Color: Black
Assistant Support: Google Assistant, Siri
Outdoor: Yes
Connectivity: Bluetooth, NFC
Max Wattage: 120 W
Battery Life: 32 hr battery life

Questions and answers

How long does the battery really last?: Monster rates it at up to 32 hours. Expect less at high volume, since loud playback drains any battery faster than background listening.
Is it waterproof?: No water-resistance rating is listed, so keep it out of rain and away from pools and splashes.
Can I use it with Siri or Google Assistant?: Yes. It supports both Siri and Google Assistant, so you can trigger your phone's assistant through the speaker.
Does it have NFC?: Yes. NFC is included for quick tap-to-pair with compatible phones, alongside standard Bluetooth.
Can I plug in a wired source?: No aux or other wired input is listed. Bluetooth and NFC are the only connection options.
Is it good for outdoor use?: It is marketed for outdoor use and plays loud, but without a weather rating it is better suited to dry outdoor settings than to beach or poolside use.
Where is the Monster Superstar S320 Bluetooth Speaker cheapest?: At Walmart, for $35.89, 64% off, as of our latest check.

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