Short answer: the Ultimate Ears Wonderboom 4, though neither ranks well in its class. It ranks #109 of 179 medium speakers by sound quality, rated 2.9/5, at $64.99. The DOSS E-Go II ranks #148, rated 2.5/5, at $39.90, $25.09 cheaper, a saving that is not big enough to make up the sound-quality gap. Both are rated below 3.0/5 among the 179 medium speakers; for better sound, the EarFun Uboom L ranks #2 at $49.79.
The Ultimate Ears Wonderboom 4 is the better-sounding option. A small, tough waterproof speaker with a strap loop and USB-C charging, easy to clip on a bag for outdoor trips. It charges over USB-C rather than Micro USB. The tradeoff: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
Why pick the DOSS E-Go II: A water bottle sized stereo speaker with water resistance and quick pairing, light enough for a cup holder or bag. It keeps a wired aux input, which the Ultimate Ears Wonderboom 4 lacks. It plays in stereo from a single unit, unlike the Ultimate Ears Wonderboom 4. The tradeoff: Horribly bad unless turned up, still not great.
Buy the Ultimate Ears Wonderboom 4. It is rated higher for sound quality, and saving $25.09 with the DOSS E-Go II does not make up for the sound-quality gap.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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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Specifications Side By Side
| Ultimate Ears Wonderboom 4 | DOSS E-Go II | |
|---|---|---|
| Price | $64.99 | $39.90 |
| Ranked | #109 of 179 in Medium Size Portable Bluetooth Speakers | #148 of 179 in Medium Size Portable Bluetooth Speakers |
| Battery Life | 14 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Maximum SPL | 87dB (Manufacturer specified) | - |
| Power Input | USB-C | Micro USB |
| Stereo | No | Yes |
| Omnidirectional | Yes | No |
| Weight | 0.9 lbs (420 g) | 0.9 lbs (399 g) |
| IP Rating | IP67 | IPX6 |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.2 | 4.1 |
| Dimensions | 4.1” x 3.8” (104 x 95.3 mm) | 7.8” x 2.5” x 2” (198 x 63 x 51 mm) |
| Drivers | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) | 2x 6W full-range drivers + 1x passive radiator |
| TWS | Yes | No |
| Party Mode | No | - |
| App | No | No |
| EQ | No | No |
| Built-in Microphone | No | Yes |
| Power Bank | No | - |
| Aux Input | No | Yes |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Strap | Yes (built-in loop) | Yes (strap) |
| Bass Extension (-10dB) | - | 120Hz |
| MicroSD Playback | - | Yes |
| Amplifier Power | - | 12W |
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