Short answer: the Ultimate Ears Miniroll. It ranks #12 of 62 small speakers by sound quality, rated 3.9/5, at $49.99. The Monster Bluetooth Speaker ranks #39, rated 3.0/5, at $19.99, $30 cheaper, which does not close the gap in sound quality.
The Monster Bluetooth Speaker is the lighter option. A very cheap, light waterproof travel speaker with USB-C charging, aux and microSD playback, and stereo pairing. At 0.4 lbs (185 g) it weighs noticeably less than the Ultimate Ears Miniroll at 0.6 lbs (279 g). It keeps a wired aux input, which the Ultimate Ears Miniroll lacks. The tradeoff: Its tiny 36mm driver has very limited bass (about 95Hz at -10dB), elevated mids and rolled-off highs.
The Ultimate Ears Miniroll is the better-sounding, longer-running pick. A waterproof strap on mini speaker with clear mids and highs, a warm balance, and a long battery for its size. It is rated for 12 hours of battery against 6.5 for the Monster Bluetooth Speaker. It links with other speakers (PartyUp/Auracast, Miniroll-only), which the Monster Bluetooth Speaker cannot. The catch: Bass does not reach as deep as the best-rated speakers.
Buy the Ultimate Ears Miniroll. It is rated higher for sound quality, and the $30 saving on the Monster Bluetooth Speaker is not enough to make up the difference.
Looking for alternatives? See the complete Portable Bluetooth rankings.
A very cheap, light waterproof travel speaker with USB-C charging, aux and microSD playback, and stereo pairing.
A waterproof strap on mini speaker with clear mids and highs, a warm balance, and a long battery for its size.
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Specifications Side By Side
| Monster Bluetooth Speaker | Ultimate Ears Miniroll | |
|---|---|---|
| Price | $19.99 | $49.99 |
| Ranked | #39 of 62 in Small Size Portable Bluetooth Speakers | #12 of 62 in Small Size Portable Bluetooth Speakers |
| Bluetooth Version | 5.4 | 5.3 |
| App | No | No |
| Aux Input | Yes | No |
| Bass Extension (-10dB) | 95Hz | - |
| Battery Life | 6.5 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| EQ | No | No |
| IP Rating | IPX7 | IP67 |
| MicroSD Playback | Yes | - |
| Party Mode | No | Yes (PartyUp/Auracast, Miniroll-only) |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | Pointing up |
| TWS | Yes | Yes |
| Weight | 0.4 lbs (185 g) | 0.6 lbs (279 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | Yes |
| Amplifier Power | 5W | 3W RMS |
| Dimensions | Specifications vary by model | 4.8” x 4.1” x 1.9” (122.7 x 105 x 48.1 mm) |
| Drivers | 1.4” (36mm) full-range driver | 45.6mm active with passive radiator |
| Digital Aux Input | No | No |
| Strap | Yes (carabiner hook, suction cup) | Yes (built-in strap) |
| Charging Time | - | 2.3 hours |
| Maximum SPL | - | 83dB (Manufacturer specified) |
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