UA True Wireless Flash X - Engineered by JBL - Black - Waterproof true wireless sport earbuds - Hero UA True Wireless Flash X - Engineered by JBL - Black - Waterproof true wireless sport earbuds - Front UA True Wireless Flash X - Engineered by JBL - Black - Waterproof true wireless sport earbuds - Detailshot 1
UA True Wireless Flash X - Engineered by JBL - Black - Waterproof true wireless sport earbuds - Hero

UA True Wireless Flash X - Engineered by JBL

UA True Wireless Flash X offers a cable-free truly wireless experience to push athletes to perform their best. UA waterproof technology allows training in all conditions, and Sport Flex Fit ear tips provide a comfortable yet snug fit that provides Passive Noise Cancellation for superior focus. JBL Charged Sound was tuned to maximize motivation, and Bionic Hearing features TalkThru Technology to quickly interact with your workout partner, and Ambient Aware Technology to hear your surroundings for increased safety. With up to 50 hours of battery life and a durable aluminum charging case, these headphones help you break the limits.

Product Specifications

General Specifications

Ear tip material Silicon
Driver size (mm) 5.8

Audio Specifications

Driver sensitivity at 1kHz/1mW (dB) 96
Dynamic frequency response range (Hz) 20 Hz – 22 kHz
Impedance (ohms) 14
Number of drivers per ear 1

Dimension Specifications

Weight (g) 本体左右各約8.5g, 充電ケース約103g

Control Connect Specifications

Bluetooth profiles A2DP V1.3, AVRCP V1.6, HFP V1.7
Bluetooth frequency 2.4 GHz – 2.4835 GHz
Bluetooth transmitted modulation GFSK, π/4-DQPSK, 8-DPSK
Bluetooth transmitter power 0 - 8.5dbm
Bluetooth version 5.0
Please consult the documents for in-depth specs

Documents & Downloads


What’s in the Box

  • 1 x UA True Wireless Flash X Headphone
  • 1 x USB Type-C Cable
  • 3 x Ear Tips
  • 3 x Sport Flex Fit Ear Fins
  • 1 x Charging Case
  • 1 x 12-month UA MAPMYRUN Premium Membership
  • 1 x Quick start guide / Safety Sheet / Warranty Card / Warning Sheet
UA True Wireless Flash X - Engineered by JBL - What's in the Box

FAQs & How-Tos

  • Is Volume Control Supported?

    This headphone does not feature volume control. You must manually control volume from your device.

  • Voice Assist Information

    To activate the voice assistance, press and hold the center button on the RIGHT ear for 2 seconds until you hear your music stop. You will be able to speak to VA through your headphones and it should comply with your command.


    Product information
  • Pairing Information

    To power on and pair the headphones, remove the ear tips from the charging case. If this is your first time using the headphones, they will automatically go into pairing mode. You will see the blue and red LED light flash on the RIGHT and LEFT ear as it attempts to pair with your device. Make sure your device is in range and BT settings are ON. The JBL True Wireless Flash X should pop up on your list of discoverable devices within 3-5 seconds, tap and connect. Once connected, you will see a slow blinking blue light below the UA logo on the RIGHT and LEFT Ear. This headphone allows you to use the ear tips in Stereo or Mono mode. If you wish to just use the LEFT or RIGHT ear, simply place the ear tip you do not wish to use back in the charging case.
  • TalkThru Technology

    To activate TalkThru Technology, press the LEFT ear for a short press for 1 Second which allows you to clearly hear others for quick conversations without removing headphons. Music volume level should lower when TalkThru is engaged. Press again for 1 second to turn off Talk Thru.

  • Call Information

    To take a phone call, tap the center button of the right or left ear for 1 second. To hang up a call, tap and hold the center button for 1 second. To ignore a call, tap and hold center button for 3 seconds until music resumes. You may also use the ear buds in MONO or STEREO mode which allows you to make a call or listen to music on either bud independently.


    Product information
  • Playback Time Information

    When fully charged, you should expect to receive up to 10 hours of audio playback. You should receive up to 40 hours in the  charging case when case is fully charged.


    Product information
  • Charging Information

    To charge the headphones, place inside charging case. While charging, both LEFT and RIGHT ear bud will display a sold red light. Once the headphones are fully charged. The red light will turn OFF. When the charging case is fully charged, the white LED's will light up accordingly. Battery life can last for 10-hours per charge. You may recharge your earphones for another 40-hours playtime with the charging case. It takes 2 hours to fully charge the charing case.  


    Product information
  • Waterproof Information (IPX7)

    This unit is IPX7 rated, which means that you can submerge the unit in water as deep as 3 feet (1 meter) for up to 30 minutes.



    Product information
  • Manually Connecting

    The Left and Right bud should sync together automatically when removed from the case. If the Left and Right bud do not sync together automatically within 15 seconds, you may manually sync the buds together. With the buds out of the case, press the center button on each bud 3x. This action does not have to be done simultaneously. You may start with either the L or R bud to initiate syncing.


  • Fit and Sizing

    Try all Flex Fit Ear fins included (S/M/L) to find a snug fit for stability during workout. Usually the biggest size that fits comfortably in your ear will provide the most stability. Try all ear tip sizes (S/M/L) to find a snug seal for optimum sound quality, and look for a balance of comfort and acoustic sealing.


    Getting started

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