Short answer: the Noxgear 39g, if you are buying new. The Monster Atomic Atom ranks higher than it (#31 vs #48 of 49 small speakers, 3.1/5 vs 2.2/5) but is discontinued, so only consider it used; the Noxgear 39g is still sold new at $69.95.
Why pick the Monster Atomic Atom: Very small, one of the smallest in the small class and good performance based on the size and weight. Watch for: For the small class, lacking quite a bit of bass compared to the top ranked speakers.
Why pick the Noxgear 39g: Magnetic clip attaches through a shirt/jacket without pins. The catch: It sounds worse than a clock radio with the worst bass of any speaker.
Buy the Noxgear 39g new; the Monster Atomic Atom is no longer sold new, so it only makes sense as a used find.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Monster Atomic Atom | Noxgear 39g | |
|---|---|---|
| Price | $40 Discontinued | $69.95 |
| Ranked | #31 of 49 in Small Size Portable Bluetooth Speakers | #48 of 49 in Small Size Portable Bluetooth Speakers |
| App | No | No |
| Aux Input | No | No |
| Bass Extension (-10dB) | 90Hz | ~300Hz |
| Battery Life | 9 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| EQ | No | No |
| IP Rating | IPX5 | IPX7 |
| MicroSD Playback | No | - |
| Party Mode | Yes (Broadcast Mode, up to 100 speakers) | No |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| TWS | No | No |
| Weight | 0.4 lbs (159 g) | 0.1 lbs (39 g) |
| Built-in Microphone | Yes | Yes |
| Stereo | No | No |
| Omnidirectional | Pointing up | Pointing up |
| Bluetooth Version | 5.4 | - |
| Drivers | 33mm | N52 neodymium |
| Charging Time | 2 hours | 3 hours |
| Amplifier Power | 3W | - |
| Dimensions | 2.6” x 1.9” x 1.3” (65 x 47.8 x 32 mm) | 2.6” x 1.6” x 0.9” (66 x 41 x 23 mm) |
| Digital Aux Input | No | No |
| Strap | - | Yes (clip) |
Related Speaker Comparisons
More worthwhile head-to-heads for Monster Atomic Atom:
- JBL Clip 5 vs Monster Atomic Atom
- JBL Go 5 vs Monster Atomic Atom
- Onn Small Rugged Speaker vs Monster Atomic Atom
- Monster Atomic Atom vs Muzen Wild Mini
- JBL Go 5 vs Noxgear 39g
Prices on this page were last checked September 30, 2026 at 2:57 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
Monster Atomic Atom: $40 Discontinued eBay
Pros: Very small, one of the smallest in the small class and good performance based on the size and weight. Nice magnetic clip with hole for hanging. Measured bass extension of 90Hz (-10dB).
Cons: For the small class, lacking quite a bit of bass compared to the top ranked speakers. Discontinued and no longer sold new.
Full Monster Atomic Atom review and specifications →
| Amplifier Power | 3W |
|---|---|
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 90Hz |
| Battery Life | 9 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.4 |
| Built-in Microphone | Yes |
| Charging Time | 2 hours |
| Digital Aux Input | No |
| Dimensions | 2.6” x 1.9” x 1.3” (65 x 47.8 x 32 mm) |
| Drivers | 33mm |
| EQ | No |
| IP Rating | IPX5 |
| MicroSD Playback | No |
| Omnidirectional | Pointing up |
| Party Mode | Yes (Broadcast Mode, up to 100 speakers) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| TWS | No |
| Weight | 0.4 lbs (159 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Noxgear 39g: $69.95 Amazon eBay
Pros: Magnetic clip attaches through a shirt/jacket without pins. Blue safety light for visibility when running in low light. It’s only 39g of weight. ~15 hour battery life. Measured bass extension of ~300Hz (-10dB).
Cons: It sounds worse than a clock radio with the worst bass of any speaker. It’s a huge compromise in sound for the small weight.
Full Noxgear 39g review and specifications →
| App | No |
|---|---|
| Aux Input | No |
| Bass Extension (-10dB) | ~300Hz |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Built-in Microphone | Yes |
| Charging Time | 3 hours |
| Digital Aux Input | No |
| Dimensions | 2.6” x 1.6” x 0.9” (66 x 41 x 23 mm) |
| Drivers | N52 neodymium |
| EQ | No |
| IP Rating | IPX7 |
| Omnidirectional | Pointing up |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (clip) |
| TWS | No |
| Weight | 0.1 lbs (39 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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