







SUPRA NiTRO-TX PRO
- Active hybrid noise cancelling 40dB
- SUPRA AutoPause© sensors
- Multipoint - connects to two devices at the same time
- SUPRA Audio© app for personal customization
- SUPRA HexaTech© microphones
- Award-winning sound design
- Wireless charging
Fast and traceable deliveries
Here you can compare NiTRO-TX PRO with our similar True Wireless earbuds.
Sound by Sweden ships its products with PostNord and DHL, where you can choose between home delivery to your mailbox/door or delivery to a service point. The delivery time within Sweden is 1–3 business days for both services.
Here we’ve gathered the technical specifications for NiTRO-TX PRO
Here you can find answers to the most common questions about NiTRO-TX PRO.


SUPRA HexaTech© 6-way microphone technology with active hybrid noise cancelling
Choose what you want to hear – and how you are heard
SUPRA HexaTech© is based on six strategically placed microphones, finely tuned for precise voice reproduction and working together with proprietary, AI-driven software. The algorithms continuously analyze the environment and effectively reduce disturbing sounds from traffic, ventilation systems, and cabin environments.
The result is top-tier hybrid active noise cancelling – with clear and natural call audio, optimized for crystal-clear voice calls, professional video meetings, and accurate voice control.

Experience the difference with high‑resolution audio
Award-winning, premium-class sound design
The sound profile in NiTRO-TX PRO is finely tuned according to our multi-award-winning sound design, developed through years of audio engineering expertise and meticulous calibration. It has received several distinctions, including “Masterpiece” and “Product of the Year”.
The result is a clean, powerful, and balanced reproduction with high detail – regardless of volume level. In NiTRO-TX PRO, the acclaimed sound character of the NiTRO series has been refined even further, with the proprietary SBS10Dv.1 driver delivering a truly top-class listening experience.

Multipoint – switch seamlessly between mobile and computer
Maximum ease of use
NiTRO-TX PRO is equipped with Multipoint technology, which means you can connect the earphones to two devices at the same time – for example your phone and your computer.
Switch smoothly between a video call on your computer and an incoming call on your phone – without having to disconnect or re-pair. You’re always ready to listen, talk or work – no matter which device you’re using.

SUPRA AutoPause© sensors – automatic pause and playback
Intuitive control with smart sensor technology
NiTRO-TX PRO is equipped with advanced in-ear sensors that automatically detect when the earbuds are in use. When you take one earbud out, the sound pauses immediately, and when you put it back in, playback resumes – completely without pressing any buttons.
Perfect when you quickly need to interact with your surroundings without losing the rhythm of your music or the flow of your audiobook.

SUPRA AeroTech FRP© – durable, military-grade lightweight material
Built to withstand more
NiTRO-TX PRO is built using our proprietary SUPRA AeroTech FRP©, a high-performance fibre-reinforced composite material. This type of FRP composite is often used in the military aviation industry thanks to its extreme durability relative to weight – properties that make the material ideal for creating durable, robust and at the same time lightweight products.
Combined with an IPX5 rating, the earphones can handle sweat, rain and demanding daily use – whether you’re at the office, on the go or in motion.

For personalization of sound and functions
SUPRA AUDIO© app
The SUPRA Audio© app lets you customise NiTRO-TX PRO according to your own preferences. Here you get everything you need to shape the sound – and the user experience – exactly the way you want.
- Adjust the sound to your own preferences
- Choose between preset sound profiles
- Switch between ANC modes
- Find lost earphones
- Monitor battery levels
- Assign your own functions to the buttons
- Timer function for auto power-off
The app can be downloaded from the App Store™ and Google Play™.

SUPRA AeroMag© – 35 h playtime, wireless charging and ultra-compact design
Slim design. Maximum battery life
SUPRA AeroMag© is a charging case developed to match the professional character of NiTRO-TX PRO. With its slim form factor, clean design, and robust construction, it feels just as natural on your desk as in your pocket or bag.
Despite its compact size, AeroMag© delivers up to 35 hours of total battery life, with each charge providing up to 7 hours of playtime.
LED indicators give you a clear overview of the remaining capacity, and when it’s time to charge you can easily choose between wireless Qi charging or USB-C.

Accessories
3 pairs of silicone ear cushions (small, medium, large)
1 x SUPRA® USB-C charging cable
Manual
More information
Technical specifications
Earbud weight: 3.9 g each
SUPRA AeroMag© charging case weight: 45 g
Earbud dimensions: 29.7 x 19 mm
Charging case dimensions: 60 x 27.5 x 44 mm
IP rating: IPX5
Operating temperature: -20 to +60°C
Microphone: SUPRA HexaTech© with digital MEMS technology and ENC -40 dB +/- 3 dB
Driver unit: Proprietary 10 mm dynamic, SBS10Dv.1
Frequency response: 20 Hz–20 kHz
Impedance: 32 Ohm
Sensitivity: 99 dB @ 1 kHz
Distortion: 2%
Total battery life: 35 hours
Earphone charging time: 1 hour
AeroMag© charging time: 2 hours (0 > 100%)
Charging port input: USB-C
RWS = Real Wireless Stereo
TWS Plus = Mono function (one earbud at a time)
BLE = Bluetooth Low Energy
EDR = Enhanced Data Rate with support for 3 Mbit/s data transfer.
Supports the protocols: HFP, HSP, A2DP, AVRCP
Comparison table
Of similar products in our true wireless range.




3.9g per earpiece
3.5g per earpiece
3.5g per earpiece
45g
68g
68g
Yes, active hybrid noise cancellation
Yes, active noise cancelling
Yes, active hybrid noise cancelling
SUPRA HexaTech© (6-way microphone technology)
SUPRA QUAD Response© (4-way microphone technology)
SUPRA QUAD Response© (4-way microphone technology)
7 hours
6 hours
7 hours
35 hours
100 hours
120 hours
IPX5
IPX5
IPX6
10mm dynamic, SBS10Dv.1
8 mm dynamic, SBS8Dv.3
8mm dynamic (SBS8Dv2)
20Hz-20kHz
20Hz-20kHz
16HZ-22kHz
32 Ohm
16 Ohm
24 Ohm
99dB @ 1kHz
106db @ 1kHz
97db @ kHz
2%
2%
2%
Yes
Yes
No
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes
Touch buttons (In-ear detaction)
Multifunctional buttons
Multifunctional buttons
3 pairs of silicone ear cushions (small, medium, large)
1 x SUPRA® charging cable USB-C
Manual
3 pairs of ear cushions in different sizes
Powermag II© charging case
USB-C charging cable
Manual
3 pairs of Comfort Foam Tips©
3 pairs of ear cushions in different sizes
Powermag II© charging case
USB-C charging cable
Manual
FAQ
Frequently asked questions
Here we’ve collected the most common questions about NiTRO-TX PRO.
Does NiTRO-TX PRO have noise cancellation?
Yes, the NiTRO-TX PRO wireless earphones are equipped with advanced active hybrid noise cancelling (ANC). Using SUPRA HexaTech© technology and six strategically placed microphones, the earphones continuously analyse your surroundings and effectively filter out disturbing sounds such as traffic, ventilation systems and cabin noise.
The AI-driven software optimises the noise cancelling in real time, giving you a more focused audio experience whether you’re listening to music, joining video meetings or using voice control. The result is crystal-clear sound and improved call quality even in noisy environments.
Does NiTRO-TX PRO have a good microphone?
Yes, NiTRO-TX PRO is equipped with an advanced microphone solution that delivers very high call quality. With SUPRA HexaTech© technology and six strategically placed microphones, your voice is captured clearly while disturbing background noise is effectively filtered out.
The AI-powered software analyzes your surroundings in real time and optimizes the sound to provide crystal-clear calls, even in noisy environments such as traffic or open-plan offices. This makes NiTRO-TX PRO an excellent choice for phone calls, video meetings, and voice control.
Are NiTRO-TX PRO good for calls and video meetings at work?
Yes, NiTRO-TX PRO is an excellent choice for calls, video meetings, and work in both quiet and noisy environments. The earbuds use SUPRA HexaTech© technology with six strategically placed microphones which, together with AI-powered software, ensure that your voice is heard clearly.
The intelligent algorithms effectively filter out background noise such as traffic, ventilation systems, and office chatter, providing crystal-clear audio quality for phone calls and online meetings. The advanced hybrid noise cancelling also helps you stay more focused, even in distracting environments.
The result is a stable and professional audio experience that makes NiTRO-TX PRO particularly well-suited for work, remote meetings, and everyday communication.
How good is the sound on NiTRO-TX PRO?
NiTRO-TX PRO offers top-class sound quality with a finely tuned sound profile based on multi-award-winning sound design. Through years of audio engineering expertise and meticulous calibration, the sound has been optimized to deliver clean, powerful and balanced reproduction with high detail.
The proprietary SBS10Dv.1 driver further enhances the experience and delivers clear, dynamic sound whether you’re listening to music, podcasts or calls. The sound character builds on the NiTRO series’ acclaimed signature and has been awarded distinctions such as “Masterpiece” and “Product of the Year”.
The result is a premium sound experience with clear separation, deep bass and crystal-clear detail – at any volume level.
Are NITRO-TX PRO good headphones for working out?
Yes, NiTRO-TX PRO is an excellent choice for training, running and an active lifestyle. The earphones are built in SUPRA AeroTech FRP©, an advanced fiber-reinforced composite material known for its high durability relative to weight. This makes them both robust and lightweight – perfect for movement and intensive use.
With an IPX5 rating, NiTRO-TX PRO is also resistant to sweat and rain, meaning they can handle everything from gym sessions to runs in varying weather conditions. The construction is designed to last over time, even with daily and active use.
The result is a pair of durable and reliable sports earphones that combine comfort, low weight and toughness – whether you’re training at the gym or outdoors.
Can NiTRO-TX PRO connect to multiple devices at the same time (Multipoint)?
Yes, NiTRO-TX PRO supports Multipoint technology, which means you can connect the earphones to two devices at the same time – for example your phone and your computer.
This allows you to easily switch between different devices without having to disconnect or re-pair the earphones. For example, you can join a video meeting on your computer and immediately take an incoming call on your phone, completely seamlessly.
This feature makes NiTRO-TX PRO a practical choice for both work and everyday life, where you need to quickly switch between calls, music and meetings on different devices.
Can you use a single earbud at a time with NiTRO-TX PRO?
Yes, you can use one earbud at a time with NiTRO-TX PRO, which makes them perfect for both calls and everyday use. This feature means you can use either the left or right earbud on its own while the other remains in the charging case.
This is especially practical if you want to:
- Take calls with one earbud while staying aware of your surroundings
- Extend battery life by switching between the earbuds
- Listen comfortably for longer periods without using both at the same time
When you use a single earbud, it still works fully with the same high sound quality and stable connection as when using both.
Does NiTRO-TX PRO support Qi charging?
Yes, NiTRO-TX PRO supports wireless Qi charging via its SUPRA AeroMag© charging case. You can easily charge the case wirelessly on a Qi-compatible charging pad, making everyday charging smooth and cable-free.
For extra flexibility, you can also charge via USB-C. The compact charging case offers up to 35 hours of total battery life, with the earphones providing up to 7 hours of playtime per charge.
LED indicators on the case clearly show the battery status, so you always know when it’s time to charge. The combination of Qi charging and long battery life makes NiTRO-TX PRO a practical choice at home, in the office, and on the go.
Does NiTRO-TX PRO have auto-pause and touch controls?
Yes, NiTRO-TX PRO features both auto-pause via in-ear detection and convenient touch controls. Sensors detect when the earbuds are removed from your ears and pause the audio immediately. When you put them back in, playback resumes automatically. The touch controls make it easy to manage your music and calls with a light tap.
Is NiTRO-TX PRO compatible with an app (iOS and Android)?
Yes, NiTRO-TX PRO is compatible with the SUPRA Audio© app, available for both iOS (App Store™) and Android (Google Play™). With the app, you can easily customize the earbuds to your own preferences and gain full control over both sound and features.
Among other things, you can adjust the sound profile, choose between preset sound modes and switch between different ANC modes. The app also lets you customize the touch controls, view battery levels, use a timer for automatic power-off and find lost earbuds.
This makes NiTRO-TX PRO a flexible choice if you want to fine-tune both the listening experience and how you use them in detail.
