Short answer: the Tronsmart Mirtune S100. It ranks #97 of 179 medium speakers by sound quality, rated 3.1/5, at $79.99. The Ultimate Ears Wonderboom 4 ranks #109, rated 2.9/5, at $64.99, $15 cheaper, a saving that is not big enough to make up the sound-quality gap.
The Tronsmart Mirtune S100 is the longer-running option. A waterproof speaker with long battery life for outdoor and casual listening. It is rated for 20 hours of battery against 14 for the Ultimate Ears Wonderboom 4. It keeps a wired aux input, which the Ultimate Ears Wonderboom 4 lacks. It has an adjustable EQ, which the Ultimate Ears Wonderboom 4 lacks.
The Ultimate Ears Wonderboom 4 is the lighter pick. A small, tough waterproof speaker with a strap loop and USB-C charging, easy to clip on a bag for outdoor trips. At 0.9 lbs (420 g) it weighs much less than the Tronsmart Mirtune S100 at 3 lbs (1.36 kg). The tradeoff: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
Buy the Tronsmart Mirtune S100. It is rated higher for sound quality, and the $15 saving on the Ultimate Ears Wonderboom 4 is not enough to make up the difference.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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
| Tronsmart Mirtune S100 | Ultimate Ears Wonderboom 4 | |
|---|---|---|
| Price | $79.99 | $64.99 |
| Ranked | #97 of 179 in Medium Size Portable Bluetooth Speakers | #109 of 179 in Medium Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | ~64Hz | - |
| Battery Life | 20 hours (Manufacturer specified) | 14 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| IP Rating | IPX7 | IP67 |
| Stereo | Partially | No |
| Omnidirectional | No | Yes |
| Weight | 3 lbs (1.36 kg) | 0.9 lbs (420 g) |
| Wi-Fi | No | - |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.2 |
| Dimensions | 9.1” x 3.5” x 3.9” (231 x 88 x 100 mm) | 4.1” x 3.8” (104 x 95.3 mm) |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 50W | - |
| Drivers | 20W drivers | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC |
| App | Yes | No |
| Aux Input | Yes | No |
| EQ | Yes | No |
| TWS | Yes | Yes |
| Power Input | USB-C | USB-C |
| Maximum SPL | - | 87dB (Manufacturer specified) |
| Party Mode | - | No |
| Power Bank | - | No |
| Strap | - | Yes (built-in loop) |
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