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Under Armour® Sport Wireless Flex — Engineered by JBL

Bluetooth® neckband sports headphones

Item # 109UAFLEX

These wireless headphones specialize in pumping the tunes while you work out.

These wireless headphones specialize in pumping the tunes while you work out.

California customers:
Please click here for your Proposition 65 warning.

Discontinued item
1 question

Item # 109UAFLEX

About the Under Armour® Sport Wireless Flex — Engineered by JBL

Inspiration for perspiration

Okay, I admit it: I've fallen out of my exercise routine in recent months. I'm not proud of it. But maybe all I need to get back into the groove is a great set of sports headphones — like this pair from Under Armour and JBL.

Inspiration for perspiration

Okay, I admit it: I've fallen out of my exercise routine in recent months. I'm not proud of it. But maybe all I need to get back into the groove is a great set of sports headphones — like this pair from Under Armour and JBL.

For starters, they connect wirelessly to your phone, so there's no cord to get in the way when you move around. And the flexible neckband can be adjusted to fit tightly or loosely, for a comfortable fit during or after your workout.

Safety first

One of my favorite features of these headphones is the brilliant white LED built into the neckband. It comes with three different flashing patterns to help you stay visible to passing motorists during your outdoor workouts.

A comfortable fit

Three different sizes of ear tips are included, to help you get a secure and comfortable fit. With in-ears like these, a tight seal helps you get the best possible sound, especially when it comes to the bass. The earbuds can be worn with or without winged attachments, depending on what feels best to you. And when it's time for a break, the magnetic earbuds clasp together around your neck for convenient storage.


Product highlights:

  • Bluetooth 4.1 wireless connectivity for phone calls and music playback
  • 8.6mm dynamic driver in each earpiece
  • winged and wingless ear tip enhancers help you get a secure, comfortable fit
    • includes three different sizes of ear tips
  • RunSafe™ brilliant white LED with three flashing modes to boost your visibility for safer runs
  • magnetic earbuds for convenient storage and portability
  • sweat-proof earpieces, neckband, and cable (IPX5-rated water-resistant)
  • four-button controls built into neckband
    • built-in microphone for answering calls via Bluetooth
  • built-in rechargeable battery offers up to 11 hours of listening (USB charging cable included)
    • get an hour's worth of playback on a 5-minute charge
  • free 12-month premium membership to Under Armour's MapMyRun app for Apple® or Android™
  • frequency response: 10-22,000 Hz
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's in the box:

  • Neckband in-ear wireless headphones
  • 11" USB charging cable (Type A USB on one end and Micro-B 2.0 on other end)
  • 3 Pairs of Sport Flex ear tips (1 pair installed)
  • 2 Pairs of Enhancers (1 pair installed)
  • Quick Start Guide
  • Warranty Card
  • Warning sheet
  • UA MapMyRun promo

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Under Armour® Sport Wireless Flex — Engineered by JBL reviews

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More details on the Under Armour® Sport Wireless Flex — Engineered by JBL

Mark G.

Features & specs

Fit Style In-ear/Earbud
Earcup Type ---
Earcup Width x Height 0.502" x 0.502:
Noise-canceling No
Bluetooth Yes
Bluetooth Version 4.1
Mic For Taking Calls Yes
Voice Assistant Access
Amazon Alexa No
Google Assistant Yes
Siri Yes
3.5mm No
1/4" No
Lightning No
4.4mm balanced No
XLR4 balanced No
2.5mm No
Other None
Frequency Response 10-22k Hz
Sensitivity N/A dB
Impedance N/A
Weight 1.4 ounces
Cord Length 7" ea side
Parts Warranty 1 Year
Labor Warranty 1 Year

Product Research


Overview: The Under Armour Sport Wireless Flex neckband in-ear headphones by JBL feature adjustable Flex Zones to stay in place during your activity, or loosen while you relax. The UA Sport flex headphones feature Bluetooth wireless technology, and are sweat resistant. They also have bright white LEDs to increase your visibility after dark.

Flex Zones: The UA Sport Flex neckband rests comfortably around your neck. The ear buds are attached to separate 7" cables at each end of the neckband. The ear buds are magnetic, and can be fastened together when not in use. In the normal position, the neckband gives you a relaxed fit for all day comfort. During rigorous activities, you can bend the two Flex Zones inward for a more secure fit that stays in place.

Note: The neckband Flex Zones do not bend outward.

RunSafe: The neckband is equipped with bright white RunSafe LEDs along the back. These LEDs increase your visibility at night to keep you safe. The thin light strip is approximately 5-1/2" in length with an LED at each end. There are three different light modes to choose from via the on-board controls.

Bluetooth: The wireless headphones feature Bluetooth 4.1 with the following profiles: HFP (v1.6), HSP (v1.2), A2DP (v1.2), and AVRCP (v1.5).

Drivers: The UA Sport Flex in-ear headphones are equipped with JBL 8.6mm dynamic drivers for delivering a bold JBL Charged Sound over a wide frequency response (10Hz-22kHz). The headphones are tuned for action sports with a rich bass response to move you during your workout.

Sport Flex Ear Tips: The Under Armour Sport Flex in-ear headphones come with three pairs of ear tips and two pairs of winged "enhancers." These Sport Flex silicone ear tips come in small, medium, and large. The enhancers, which come in Size 3 and Size 5, are designed to twist and tuck behind the folds of your outer ear to hold the ear tips in place, even during rigorous exercise.

Controls: The controls for the headphones are located on the ends of the neckband. Controls include: volume up/down, track up/down, play/pause, and power/pair. A multi-function button controls the RunSafe LEDs, mic mute (during calls), and Siri/Google Now.

Battery: The UA Sport Flex wireless headphones are powered by a Lithium-Ion cylindrical cell battery (3.7V, 2 x 100mAh). The battery fully charges (from empty) in approximately 2 hours, and gives you over 11 hours of battery life. A quick 5-minute Speed Charge provides approximately 1 hour of playback time. A Micro-B USB charging cable is included.

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