Short answer: the Onn Small Rugged Speaker. It ranks #35 of 62 small speakers by sound quality, rated 3.1/5, at $14.88; the Monster Bluetooth Speaker ranks #39, rated 3.0/5, and costs $19.99, so there is little reason to consider the other one.
The Onn Small Rugged Speaker is the deeper-bass option. A very cheap, tough waterproof mini speaker with USB-C charging, an aux input, and a speakerphone mic. Its bass reaches about 66Hz before falling 10dB, against 95Hz for the Monster Bluetooth Speaker. It links with other speakers (Party Sync Mode), which the Monster Bluetooth Speaker cannot. The catch: Its 1.5-inch driver cannot create meaningful deep bass (about 66Hz at -10dB) or the clarity and scale of better small speakers.
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 Onn Small Rugged Speaker at 0.6 lbs (286 g). The catch: Its tiny 36mm driver has very limited bass (about 95Hz at -10dB), elevated mids and rolled-off highs.
Buy the Onn Small Rugged Speaker. It is rated higher for sound quality than the Monster Bluetooth Speaker and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A very cheap, tough waterproof mini speaker with USB-C charging, an aux input, and a speakerphone mic.
A very cheap, light waterproof travel speaker with USB-C charging, aux and microSD playback, and stereo pairing.
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
| Onn Small Rugged Speaker | Monster Bluetooth Speaker | |
|---|---|---|
| Price | $14.88 | $19.99 |
| Ranked | #35 of 62 in Small Size Portable Bluetooth Speakers | #39 of 62 in Small Size Portable Bluetooth Speakers |
| App | No | No |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 66Hz | 95Hz |
| Battery Life | 10 hours (Manufacturer specified) | 6.5 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | No | No |
| IP Rating | IPX7 | IPX7 |
| Party Mode | Yes (Party Sync Mode) | No |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | Pointing up |
| TWS | No | Yes |
| Weight | 0.6 lbs (286 g) | 0.4 lbs (185 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Amplifier Power | 3-5W | 5W |
| Dimensions | 4.7” x 2.3” x 2.6” (119.9 x 57.9 x 65 mm) | Specifications vary by model |
| Drivers | 1.5” (38mm) full-range driver | 1.4” (36mm) full-range driver |
| Digital Aux Input | No | No |
| Bluetooth Version | - | 5.4 |
| MicroSD Playback | - | Yes |
| Strap | - | Yes (carabiner hook, suction cup) |
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