While workout earbuds are a dime a dozen, the True Wireless Flash by JBL stands out from the crowd with its Under Armour partnership. This affords listeners a one-year premium membership to MapMyRun along with athlete-friendly features to keep you safe and pumped up. But just because these are some of the best JBL headphones doesn’t mean they’re necessarily the buds to buy.

Editor’s note: this review was updated on April 25, 2020, to account for how the True Wireless Flash hold up in 2020.

Who is the Under Armour True Wireless Flash by JBL for?

As is expected with a JBL-Under Armour partnership, the True Wireless Flash are marketed toward athletes. Both the charging case and earbuds are water-resistant with the latter boasting an IPX7 certification. These aren’t just for gym rats, though. Ambient Aware can be toggled on to hear external noise and remain safe during a workout.

Related: What makes good workout earbuds?

What’s inside?

Under Armour True Wireless Flash JBL: All of the ear and wing tips included with the product

The included ear and wing tips are likely to fit most listeners and form a secure seal for accurate sound reproduction.

The Under Armour True Wireless Flash by JBL includes quite a few accessories. Under Armour provides a charging case, micro-USB cable, three pairs of ear tips, three pairs of wing tips, the IPX7 water-resistant earbuds, and a one-year MapMyRun premium membership.

Build quality

Under Armour True Wireless Flash JBL: Close up of the earbuds in the case with it sliding out.

The True Wireless Flash by JBL comes with a water-resistant charging case.

The aluminum charging case lacks any hint of a sharp edge and features a sliding mechanism to reveal the True Wireless Flash earbuds. While its large 1,500mAh capacity can’t be dispensed to other devices like the JLab Epic Air Elite’s case, it is water-resistant making it more durable than competitors. The attached cord can easily be attached to a backpack; even if it goes unused, it’s a nice touch.

Like the charging case, there’s an absence of sharp corners on the earbuds. Their stout, cylindrical form protrudes from the ear, but the matte black finish and textured design counteract the potential dorkiness factor. The Under Armour logo embellishes each earbud panel, both of which also double as buttons: the left alternates between Ambient Aware and TalkThru hearing while the right operates playback and call controls.

Listeners can operate playback and call controls via the right earbud and use the left earbud to cycle thought listening modes.

Inlaid beneath each chamber is a 5.8mm driver tuned by JBL. Even though the dynamic drivers are small, they manage to produce a booming bass-heavy sound. The earbuds won’t shake out of your skull though, thanks to the Sport Flex wing and ear tips. They securely hold onto the outer ear and create a strong seal with the proper ear tips installed.

Working out is a breeze

Under Armour True Wireless Flash JBL: Top-down image of the earbuds next to a grip strength piece of exercise equipment. There's water on the table and earbuds.

The IPX7 water-resistant rating relieves any worry of durability when working out.

Between the IPX7 certification, ergonomic wing tips, and angled nozzles, it’s apparent that the Under Armour True Wireless Flash by JBL was designed with athletes in mind. The rounded housings rest securely on the outer ear, which is great for running or weight-lifting. One downside of this is that my ears became sore after 45 minutes of wear from the silicone sleeves chaffing the cartilage. Unlike neckband earbuds, though, moving into a horizontal position to bench press doesn’t cause any undue jostling.

Operating the onboard controls is easy to do while exercising since there’s plenty of real estate for your finger to press. You can access Google Assistant or Siri via the left earbud. Unfortunately, there is about a one-second lag between when a command is made and when it’s executed, but it’s functional nonetheless.

Ambient Aware and TalkThru

A great safety feature that more workout headphones and earbuds are using is Ambient Aware, which allows you to hear external noise. This feature is a must-have for outdoor runners in particular. It also features TalkThru, which handles external sound differently.

If you plan to run outside, be sure to use Ambient Aware mode so you can remain vigilant of your surroundings.

Rather than simply allowing outside noise in through the earbuds, TalkThru amplifies human voices through the earbuds. Doing so makes it easier to hold a conversation without removing the earbuds. The relayed audio isn’t great: my friend’s voice was laden with static.

While I enjoy both features, Ambient Aware is more practical, since it’s not a big deal to remove an earbud while talking.

Battery life

Under Armour True Wireless Flash JBL: Close up of the case's micro-USB input with one earbud inserted into the case and another in the background.

It takes two hours to fully charge the carrying case which provides an additional 20 hours of playback to the Under Armour True Wireless Flash by JBL earbuds’ standalone five-hour battery life.

Battery life of the Under Armour True Wireless Flash by JBL is great; according to our objective testing, standalone battery life clocks in at 4.95 hours. This nearly reaches the posited five-hour battery life, and if you play your music at lower volumes than 75dB—which you probably do—then you’ll benefit from extended playback times.

For the price, it’s surprising that the Flash by JBL uses micro-USB charging rather than USB-C. However, this seemingly archaic choice is forgivable since it takes just two hours to complete a full charge cycle. Plus, the water-resistant charging case provides an extra 20 hours of battery life, so it’s unlikely you’ll be without power.


Unfortunately, connectivity of the Under Armour True Wireless Flash by JBL is fickle even for true wireless. Connectivity stutters, while not frequent, occur a few times an hour which may be too off-putting for some. The earbuds operate via Bluetooth 4.2 and—unlike the Plantronics BackBeat Fit 3100—don’t support multipoint connectivity. Additionally, if you plan to stream Netflix from the treadmill, you’ll experience some audio-visual lag as these don’t support any high-quality Bluetooth codecs to reduce latency. With all that said, auto-connect works without a hitch.

Sound quality

As depicted by the frequency response chart, the True Wireless Flash by JBL puts bass reproduction first. Even though most consumer-friendly audio products are tuned to exaggerate the low-end, this takes the cake. To experience this same bass response without compromising clarity, make sure to find the right fitting ear tips for your ear canals. This takes just a few moments and if none of the included ones work, there are always third-party options.

Lows, mids, and highs

Under Armour True Wireless Flash JBL: A woman wearing the earbuds.

The earbuds protrude from the ear but are reasonably bulky.

The first 33 seconds of Stromae’s song Papaoutai is clearly reproduced. The opening Dm-Am-C-Dm-G chord progression repeated in the first 13 seconds of the song sounds fine; though even here, the harmonics of each chord are difficult to catch and other instruments have yet to enter the song.

During the first verse, vocals dominate the song until the chorus starts at 0:49. At this point, multiple percussive instruments come into play and are followed by synthesized sounds which mask Stromae’s lamenting tone. It’s during the chorus that the lack of clarity becomes apparent: the Under Armour True Wireless Flash can manage fairly accurate reproduction of narrow frequency ranges but accounting for the audible spectrum proves difficult.

On the whole, this emphatic bass response is preferred while exercising as I want to hear the beat while my feet hit the pavement. For general listening, though, the sound quickly becomes irritating.

Should you buy the True Wireless Flash in 2020?

Under Armour True Wireless Flash JBL: Solo image of the earbuds on a black table.

While $169 is a hefty price to pay for true wireless workout earbuds, the Under Armour True Wireless Flash by JBL earbuds are a great option for those not bound to a specific budget.

These earbuds were good when they came out, but as the years have passed, these earbuds are less and less impressive compared to the competition. There are plenty of great options abound, however; in fact, we’ve even compiled an entire list of the best true wireless workout earbuds. If you want to stick to a $150 budget, the Jabra Elite 75t ‘buds are a great pick. Alternatively, you could even get the Samsung Galaxy Buds Plus, which feature IPX2 water-resistance as well as Spotify integration. There are plenty of excellent alternatives, and it’s not that the Under Armor True Wireless Flash is a bad deal, rather that there are much better ones out there.

Still looking? Read up on our list of the best true wireless earbuds

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Under Armour True Wireless Flash by JBL