Short answer: the Monster S380, though neither ranks well in its class. It ranks #137 of 175 medium speakers by sound quality, rated 2.6/5, at $49.99. The DOSS E-Go II ranks #145, rated 2.5/5, at $39.90, $10.09 cheaper, a saving that is not big enough to make up the sound-quality gap. Both are rated below 3.0/5 among the 175 medium speakers, so if sound quality matters, consider the EarFun Uboom L instead, ranked #2 at $49.79.
The case for the DOSS E-Go II: Very portable (water bottle sized), truly waterproof (IPX6), 12-hour battery life, excellent value for money, fast Bluetooth pairing. The catch: Horribly bad unless turned up, still not great.
The Monster S380 is the longer-running pick. Rated for 20 hours with IPX6 water resistance, Bluetooth 6.0, aux and microSD inputs, a speakerphone microphone, TWS stereo pairing and a carry lanyard for about $50. It is rated for 20 hours of battery against 12 for the DOSS E-Go II. It charges over USB-C rather than Micro USB. Watch for: No measurements or substantive reviews, so its rating is estimated, and the 40 watt claim is unverified.
Buy the Monster S380. It is rated higher for sound quality, and the $10.09 saving on the DOSS E-Go II is not enough to make up the difference.
Worth knowing: the Monster S380 has not been measured yet. Its rating is estimated from related models, with a likely range of 2.2 to 3.0, so treat this verdict as provisional.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| DOSS E-Go II | Monster S380 | |
|---|---|---|
| Price | $39.90 | $49.99 |
| Ranked | #145 of 175 in Medium Size Portable Bluetooth Speakers | #137 of 175 in Medium Size Portable Bluetooth Speakers Estimated |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 120Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| MicroSD Playback | Yes | Yes |
| IP Rating | IPX6 | IPX6 |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 4.1 | 6.0 |
| Dimensions | 7.8” x 2.5” x 2” (198 x 63 x 51 mm) | - |
| Drivers | 2x 6W full-range drivers + 1x passive radiator | - |
| Built-in Microphone | Yes | Yes |
| Stereo | Yes | - |
| Omnidirectional | No | - |
| Power Input | Micro USB | USB-C |
| Weight | 0.9 lbs (399 g) | - |
| Amplifier Power | 12W | 40W |
| Digital Aux Input | No | - |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | - |
| App | No | No |
| EQ | No | - |
| TWS | No | Yes |
| Strap | Yes (strap) | Yes (lanyard) |
Related Speaker Comparisons
How Monster S380 compares with other leading options:
- Monster S380 vs W-King D8 Mini
- Monster S380 vs Monster Shock S22
- Boat Stone 352 vs Monster S380
- Soundcore 3 vs DOSS E-Go II
- Xiaomi Sound Outdoor vs DOSS E-Go II
Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
DOSS E-Go II: $39.90 Amazon $39.90 eBay
Pros: Very portable (water bottle sized), truly waterproof (IPX6), 12-hour battery life, excellent value for money, fast Bluetooth pairing. Measured bass extension of 120Hz (-10dB).
Cons: Horribly bad unless turned up, still not great
Full DOSS E-Go II review and specifications →
| Amplifier Power | 12W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 120Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 4.1 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 7.8” x 2.5” x 2” (198 x 63 x 51 mm) |
| Drivers | 2x 6W full-range drivers + 1x passive radiator |
| EQ | No |
| IP Rating | IPX6 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Power Input | Micro USB |
| Stereo | Yes |
| Strap | Yes (strap) |
| TWS | No |
| Weight | 0.9 lbs (399 g) |
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons
Monster S380: $49.99 Estimated Amazon $49.99 eBay
Pros: Rated for 20 hours with IPX6 water resistance, Bluetooth 6.0, aux and microSD inputs, a speakerphone microphone, TWS stereo pairing and a carry lanyard for about $50.
Cons: No measurements or substantive reviews, so its rating is estimated, and the 40 watt claim is unverified. It is made under license by Oraolo rather than Monster itself, and there is no app or EQ.
Full Monster S380 review and specifications →
| Released | 2026 (this year) |
|---|---|
| Amplifier Power | 40W |
| App | No |
| Aux Input | Yes |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Version | 6.0 |
| Built-in Microphone | Yes |
| IP Rating | IPX6 |
| MicroSD Playback | Yes |
| Power Input | USB-C |
| Strap | Yes (lanyard) |
| TWS | Yes |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons