Short answer: the Teufel Rockster Go 2. It ranks #75 of 144 medium speakers by sound quality, rated 3.2/5, at $99.99; the Ultimate Ears Boom 4 ranks #93, rated 2.9/5, and costs $119.99, so there is little reason to consider the other one.
The case for the Teufel Rockster Go 2: At 0.74 kg, the IP67 Rockster Go 2 is genuinely easy to carry, and its claimed 28-hour battery life, USB-C fast charging, stereo pairing, and tripod mount suit outdoor use. Watch for: There is no companion app or 3.5 mm input.
The case for the Ultimate Ears Boom 4: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. The catch: Not much improvement over the old ones.
Buy the Teufel Rockster Go 2. It is rated higher for sound quality than the Ultimate Ears Boom 4 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.
Specifications Side By Side
| Teufel Rockster Go 2 | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $99.99 | $119.99 |
| Ranked | #75 of 144 in Medium Size Portable Bluetooth Speakers | #93 of 144 in Medium Size Portable Bluetooth Speakers |
| Aux Input | No | No |
| Battery Life | 15 hours, 28 with Eco Mode (Manufacturer specified) | 15 hours (Manufacturer specified) |
| IP Rating | IP67 | IP67 |
| Weight | 1.6 lbs (735 g) | 1.4 lbs (620 g) |
| Bluetooth Codecs | SBC, AAC | SBC |
| Dimensions | 8.3” x 4.3” x 2.4” (211 x 109 x 61 mm) | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 2x 50mm wide-band drivers + 1x 64mm passive radiator | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| TWS | Yes | Yes |
| Party Mode | Yes (Party Link, up to 100 speakers) | - |
| Built-in Microphone | No | No |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Discontinued | No | - |
| Digital Aux Input | Yes (USB-C sound card) | No |
| App | Yes (Teufel Go) | Yes |
| EQ | Yes | Yes (via app) |
| Power Input | USB-C | USB-C |
| Power Bank | No | No |
| USB Playback | No | - |
| Amplifier Power | 8W | - |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | - |
| Charging Time | 2.5 hours (Manufacturer specified) | - |
| Strap | Yes (detachable strap) | Yes (built-in loop) |
| Bluetooth Version | - | 5.1 |
| Maximum SPL | - | 85dBC (Manufacturer specified) |
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Prices on this page were last checked September 26, 2026 at 11:14 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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The Two Speakers In Full
Teufel Rockster Go 2: $99.99 Amazon eBay
Older model: the Teufel Rockster Go (rated 2.6/5).
Pros: At 0.74 kg, the IP67 Rockster Go 2 is genuinely easy to carry, and its claimed 28-hour battery life, USB-C fast charging, stereo pairing, and tripod mount suit outdoor use. Independent listening found a balanced, clear midrange and tuneful bass at sensible levels.
Cons: There is no companion app or 3.5 mm input. Reviewers found it loses some definition at maximum volume, and the claimed battery figure is optimistic for loud outdoor playback.
Full Teufel Rockster Go 2 review and specifications →
| Amplifier Power | 8W |
|---|---|
| App | Yes (Teufel Go) |
| Aux Input | No |
| Battery Life | 15 hours, 28 with Eco Mode (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC |
| Built-in Microphone | No |
| Charging Time | 2.5 hours (Manufacturer specified) |
| Digital Aux Input | Yes (USB-C sound card) |
| Dimensions | 8.3” x 4.3” x 2.4” (211 x 109 x 61 mm) |
| Discontinued | No |
| Drivers | 2x 50mm wide-band drivers + 1x 64mm passive radiator |
| EQ | Yes |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Party Link, up to 100 speakers) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (detachable strap) |
| TWS | Yes |
| USB Playback | No |
| Weight | 1.6 lbs (735 g) |
- Links
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Ultimate Ears Boom 4: $119.99 Amazon eBay
Older model: the Ultimate Ears Boom 3 (rated 2.9/5).
Pros: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. 15 hour battery. Customizable EQ and speaker-pairing via the UE app.
Cons: Not much improvement over the old ones. Weak bass extension and thuddy bass. Gets distorted above 90%
Full Ultimate Ears Boom 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Maximum SPL | 85dBC (Manufacturer specified) |
| Omnidirectional | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 1.4 lbs (620 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Boom 4 vs Ultimate Ears Boom 3
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom
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