Short answer: the Xiaomi Sound Outdoor. It ranks #46 of 177 medium speakers by sound quality, rated 3.7/5, at $49.99; the Ultimate Ears Megaboom 4 ranks #171, rated 2.1/5, and costs $200, so there is not much of a tradeoff to weigh.
The Xiaomi Sound Outdoor is the better-sounding, lighter choice. An affordable waterproof outdoor speaker with a separate tweeter, decent battery life and linking to many more speakers. At 1.3 lbs (597 g) it weighs much less than the Ultimate Ears Megaboom 4 at 2.4 lbs (1.1 kg). The catch: Bass reach is limited for the cabinet size, with a rated lower limit of 60Hz, and the boosted bass gets somewhat uncontrolled at high levels.
The Ultimate Ears Megaboom 4 is the longer-running choice. A tough waterproof speaker that floats, with USB-C charging, a long battery and PartyUp linking. It is rated for 20 hours of battery against 12 for the Xiaomi Sound Outdoor. It has an adjustable EQ, which the Xiaomi Sound Outdoor lacks. The catch: A lot of distortion at higher volumes.
Buy the Xiaomi Sound Outdoor. It is rated higher for sound quality than the Ultimate Ears Megaboom 4 and costs less, which makes it the one to get unless you need something the other one does better.
Want more options? Browse the full Portable Bluetooth rankings.
An affordable waterproof outdoor speaker with a separate tweeter, decent battery life and linking to many more speakers.
A tough waterproof speaker that floats, with USB-C charging, a long battery and PartyUp linking.
Prices on this page were last checked October 31, 2026 at 7:11 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
| Xiaomi Sound Outdoor | Ultimate Ears Megaboom 4 | |
|---|---|---|
| Price | $49.99 | $200 |
| Ranked | #46 of 177 in Medium Size Portable Bluetooth Speakers | #171 of 177 in Medium Size Portable Bluetooth Speakers |
| App | No | Yes |
| Battery Life | 12 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| EQ | No | Yes (via app) |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Speakersync, up to 100 speakers) | Yes (PartyUp up to 50 speakers) |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Weight | 1.3 lbs (597 g) | 2.4 lbs (1.1 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.4 | 5.1 |
| Dimensions | 7.7” x 2.7” x 2.6” (196.6 x 68 x 66 mm) | 3.4” x 3.4” x 8.9” (87 x 87 x 225 mm) |
| Drivers | 20W woofer, 10W tweeter + 2x passive radiators | 2x 50x50mm full-range + 2x 55x86mm passive radiators |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 30W | - |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | SBC |
| Aux Input | No | No |
| Maximum SPL | - | 91dB (Manufacturer specified) |
| Strap | - | Yes (built-in loop) |
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