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Monster S310 Upgraded Portable Bluetooth Speaker

Monster S310 Upgraded Portable Bluetooth Speaker

4.6· 11 ratings

Best price now

$34.99at WalmartObserved at 6:32 AM

34% under what the other stores charge

Compared across 4 stores. Prices are checked against each store and labelled with when.

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Our take on the Monster S310 Upgraded Portable Bluetooth Speaker

The Monster S310 is a small, rugged Bluetooth speaker rated at 30W, with Bluetooth 5.2, a built-in mic and IPX6 water resistance. Two units can pair for 60W stereo sound, and Monster claims up to 24 hours of playback at moderate volume. At $34.99 at Walmart as of November 4, 2026, it sits at the low end of what this class of speaker costs, so it is a budget pick rather than a premium one.

Best forCampers and beach-goers who want a cheap speaker they can get wetBuyers who want loud sound for under $40People who may add a second unit later for stereo pairingCasual listeners using it in the shower or kitchen
Pros
  • 30W output is strong for the price
  • IPX6 rating handles rain, splashes and poolside use
  • Bluetooth 5.2 with auto-reconnect to the last device
  • True wireless stereo pairing doubles output to 60W with a second unit
  • Built-in mic for calls
  • Lightweight and portable in black, blue or pink
Cons
  • Only 11 ratings, so the 4.6 score rests on a thin sample
  • 24-hour battery claim assumes low volume
  • No app, EQ controls or aux input listed
  • IPX6 resists splashes but is not fully waterproof or floatable
  • Brand recognition is weaker than JBL or Anker at this price

Monster S310 Upgraded Portable Bluetooth Speaker prices at every store

  • WalmartNew

    In stockSold by MCT Direct

    $34.99Observed at 6:32 AM
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  • eBayPre-owned

    In stockSold by qualityitemstore100

    $64.99Observed at 6:32 AM
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  • a4c.comRefurbished

    Availability unknown

    $29.95Observed at 7:38 AM
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  • a4c.comNew

    Availability unknown

    $39.95Observed at 7:38 AM
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  • MercariNew

    Availability unknown

    $53.20Observed at 7:38 AM
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  • eBayNew

    Availability unknown

    $65.00Observed at 7:38 AM
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Also available at

  • MonsterCheck price at Monster
  • eBayCheck price at eBay
  • Newegg.comCheck price at Newegg.com

Monster S310 Upgraded Portable Bluetooth Speaker price history

Lowest price we've seen: $34.99 on Nov 4 at Walmart. Tracked across 6 stores since Nov 4.

What reviewers say

The small pool of Walmart buyers is positive overall, with most saying it sounds better than they expected for the money. Campers and casual users report it works well outdoors.

Pros
  • Sound exceeds expectations for the price
  • Good budget choice for camping trips
  • Works reliably and sounds good
Cons
  • Too few reviews to judge long-term durability
  • Battery life at high volume is shorter than advertised

From Walmart

  • 30W true wireless stereo pairing; pair two speakers for 60W and 360° stereo sound
  • Bluetooth 5.2 for faster connection, wide range and auto-reconnect to last paired device
  • Rechargeable li-ion battery for up to 24 hours of playback at appropriate volume
  • IPX6 water-resistant for showers, pool, beach or rain
  • Built-in mic
  • Designed and engineered in the USA by Noel Lee and the Monster Design Team with deep bass and no distortion
Returns
Free holiday returns until Jan 31
Shipping
Shipping arrives Nov 6; order within 9 hr 42 min; pickup available; delivery not available

What buyers say

Buyers like
  • Well exceeds expectations
  • Great budget speaker for camping trips
  • Sounds and works great
  • People love it

Specifications

Wireless
Yes
Portable
Yes
Color
Black, Blue, Pink
Outdoor
Yes
Connectivity
Bluetooth
Max Wattage
30 W

Questions and answers

Is the Monster S310 worth it at $34.99?
For a 30W IPX6 speaker, $34.99 at Walmart as of November 4, 2026 is a low price. It makes sense if you want loud, splash-proof sound without spending much. If you need deep bass or app tuning, spend more on a JBL or Anker model.
How does it compare with the previous S310?
This is the upgraded S310, which adds Bluetooth 5.2 and stereo pairing over the earlier version. The 30W rating and IPX6 body carry over.
Does it really last 24 hours on a charge?
That figure is at moderate volume. At high volume expect noticeably less, likely closer to half that. Charge it fully before a trip.
Can I pair two S310s together?
Yes. True wireless stereo pairing links two units for 60W and 360-degree sound. You need two speakers, sold separately.
Is it waterproof enough for the pool?
It is IPX6, which means it resists splashes and rain but cannot be submerged. Keep it out of the water and off wet surfaces.
What comes in the box?
The speaker, a charging cable and a quick-start guide. A charging brick is not included.
Where is the Monster S310 Upgraded Portable Bluetooth Speaker cheapest?
At Walmart, for $34.99, 34% under what the other stores charge, as of our latest check.
What do buyers say about the Monster S310 Upgraded Portable Bluetooth Speaker?
Rated 4.6 out of 5 from 11 ratings. Buyers like: Well exceeds expectations; Great budget speaker for camping trips; Sounds and works great.
Where can I buy the Monster S310 Upgraded Portable Bluetooth Speaker?
6 stores we checked sell it, including a4c.com, Mercari, eBay, Walmart, Monster.

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