PISEN Flex S1 Wireless Earbuds: The Perfect Wireless Earbuds for an Active Lifestyle

Published on June 11, 2023, 2:52 p.m.

Looking for the perfect pair of wireless earbuds to motivate you during your workouts? The PISEN Flex S1 Bluetooth Earbuds check all the boxes with excellent sound, a secure fit, noise cancellation, waterproofing, and long battery life.


The PISEN Flex S1 earbuds have an around-the-neck flexible neckband design with 13.6mm dynamic drivers in each earbud. They utilize the latest Bluetooth 5.0 technology for stable wireless connection.

PISEN Flex S1 Wireless Headphones

Key Features

  • Bluetooth 5.0 wireless technology
  • 13.6mm dynamic drivers for immersive sound
  • Dual mics for noise cancellation on calls
  • IPX5 sweat and water resistant rating
  • 10 hours playtime, 120 hours standby
  • Magnetic earbuds for easy storage when not in use
  • Soft silicone neckband for comfort and security
  • Three sizes of ear tips for customized fit


Featuring an ergonomic around-the-neck design, the PISEN Flex S1 earbuds prioritize comfort and stability. The flexible silicone neckband provides a secure fit without putting pressure on your neck. Angled earbuds rest comfortably in your ears. With an IPX5 waterproof rating, magnetic earbuds, and three sizes of eartips, the PISEN Flex S1 Wireless Headphones are designed for sport functionality. Weighing only 0.88 ounces, you’ll barely notice them during intense activity.

Ease of Use

Using the PISEN Flex S1 Wireless Headphones is quick and seamless. Bluetooth 5.0 enables fast and stable pairing to your devices. Controls are simple with a multifunction button to manage calls and music playback. The earbuds turn on and off automatically when removed from or placed in the charging case. Everything is designed for plug-and-play simplicity.

Build Quality

Constructed from sweat-resistant silicone, the PISEN Flex S1 Wireless Headphones are built to last through tough workouts and all-day use. The IPX5 waterproof rating indicates they can withstand both heavy sweating and rainy conditions. While not indestructible, the PISEN Flex S1 Wireless Headphones can certainly endure active lifestyles. For the price, build quality is quite impressive.

Sound Quality

Equipped with 13.6mm drivers, sound reproduction is excellent considering the price point. You get powerful bass along with crisp mids and treble. Soundstage feels fairly wide for an in-ear design. Volume levels can get plenty loud to hear over gym noise. While audiophile-level quality can’t be expected at this budget, the sound definitely exceeds expectations.

Microphone Quality

Thanks to dual built-in mics and noise cancelling technology, call quality on the PISEN Flex S1 Wireless Headphones is clear and natural. Environmental noise is reduced so your voice transmits cleanly to the other party. Mics pick up less wind distortion outdoors. Voice pickup is best when the neckband is close to your mouth.

Noise Cancellation

In addition to filtering out ambient sound during calls, the dual mics also provide mild noise isolation as you listen to audio. Lower frequency droning sounds are diminished allowing you to focus on your music. The noise cancellation won’t compete with premium over-ear ANC headphones, but it’s suitable for blocking moderate environmental noise.

 PISEN Flex S1 Wireless Headphones

Battery Life

The large 110mAh battery supplies ample usage time between charges. You get approximately 10 hours of continuous playback or 120 hours standby on a full 2 hour charge. Quick charging for just 1 hour nets you enough juice for a full workout session. Battery life is a major highlight of the PISEN Flex S1 Wireless Headphones.

 PISEN Flex S1 Wireless Headphones


Bluetooth 5.0 enables quick pairing with your Bluetooth-enabled smartphone, tablet, laptop or other devices. Connection range reaches approximately 30 feet unless obstructed by structures. The earbuds can remember multiple device pairings as well so switching between devices is a breeze.


A single multifunction button on the neckband controls playback, calls, volume, track skipping, and phone assistant activation. Having all essential controls consolidated in one button keeps operation straightforward. The button is easy to find by touch when worn.

Waterproof Rating

With an IPX5 rating, the PISEN Flex S1 Wireless Headphones can withstand splashing water, heavy rain, and sweat without issue. You don’t need to worry about damaging the earbuds from intense workouts or running in wet weather. Just don’t submerge them fully in water.

 PISEN Flex S1 Wireless Headphones

Use Cases

The PISEN Flex S1 earbuds are your perfect workout companion. Their sweatproof design and secure fit allow you to vigorously exercise without worry. Run through rain puddles and intense cardio sessions while the earbuds pump out crystal clear audio to keep you motivated. The noise cancellation feature blocks distracting ambient sounds so you can zone in on your workout. With up to 10 hours of playtime, you can crush long gym sessions or marathon runs without losing your music. The PISEN Flex S1 Wireless Headphones also work great for casual everyday use like commuting, walking the dog, doing chores and more.

User Feedback Analysis

Reviews for the PISEN Flex S1 earbuds reveal predominantly satisfied customers who are pleasantly wowed by the value and performance these budget-friendly earbuds deliver.

The vast majority of users praise the PISEN Flex S1 Wireless Headphones as a solid, reliable pair of workout earbuds that punch way above their sub-$50 price point. Many reviewers compliment the impressive battery life that powers through long hours of vigorous exercise. Runners specifically appreciate how the PISEN Flex S1 Wireless Headphones’s lightweight build and secure fit allow them to focus on sprinting or pounding the pavement rather than adjusting loose earbuds. The surprising sound quality receives consistent kudos as well, with users noting the PISEN Flex S1 Wireless Headphones pack a sonic punch with deep, vibrant audio and energizing bass that provides the perfect motivational soundtrack for hardcore gym sessions.

In terms of critical feedback, sporadic issues with connectivity dropout and imbalanced sound are reported, though not widespread. A handful of users found the neckband bulky for smaller necks, and some large-eared users had trouble achieving a tight seal with the included eartips. While a few reviewers remarked on the cheap feel of the materials, most agree the build quality is respectable for the reasonable price.

Looking at the user experiences collectively, the PISEN Flex S1 Wireless Headphones appear to overdeliver on features and performance given their budget price tag. For shoppers seeking robust, workout-friendly earbuds without exorbitant costs, the PISEN Flex S1 Wireless Headphones presents a remarkably enticing value. If you can live with the occasional compromise in connectivity and fit, these wireless earbuds provide sweat-resistant durability, booming audio and marathon battery to energize your active lifestyle.

Pros & Cons


  • Great bang for your buck
  • Impressive well-balanced sound
  • Stay put during rigorous workouts
  • Sweatproof and water resistant
  • Noise cancellation works well
  • Reliable wireless connectivity
  • Long battery life up to 10 hours


  • Sound cuts out occasionally
  • Volume imbalance in some pairs
  • Lacks app for EQ adjustments
  • Neckband can sometimes feel bulky

Value & Price

Priced under $50, the PISEN Flex S1 earbuds offer tremendous value. You get a set of quality wireless earbuds with the essential features for exercise and sports. Long battery life carries you through long gym sessions. Sweatproof design ensures they can withstand intense workouts. Customizable ear tips and flexible neckband provide a stable fit. And most importantly, the sound quality punches well above their price with deep bass and clear audio. If you want affordable sports earbuds without sacrificing performance, the PISEN Flex S1 Wireless Headphones fits the bill.


With excellent battery life, sweatproof design, and customizable fit, the PISEN Flex S1 earbuds are perfectly equipped for any active lifestyle. The sound quality motivates you through rigorous workouts while the noise cancellation blocks distractions. Overall an outstanding value for wireless sports earbuds under $50.

What’s Included

The PISEN Flex S1 wireless earbuds include:

  • Left and right earbuds
  • Charging cable
  • 3 sizes of ear tips (small, medium, large)
  • Carry case
  • User manual


  • Driver: 13.6mm dynamic driver
  • Bluetooth version: 5.0
  • Battery capacity: 110mAh
  • Charging time: 1-2 hrs
  • Playback time: up to 10 hrs
  • Standby time: up to 120 hrs
  • Wireless range: Up to 30 ft
  • Waterproof rating: IPX5
  • Neckband material: Silicone
  • Eartip sizes: Small, medium, large
  • Weight: 0.88 oz

How to Use

Using the PISEN Flex S1 earbuds is quick and easy. Follow these steps:

  1. Charge the earbuds fully before first use.
  2. Turn on the earbuds and enter pairing mode - the LED will flash.
  3. On your phone, go to Bluetooth settings and select “PISEN Flex S1” to pair.
  4. Insert the earbuds and adjust until they fit comfortably. Try all ear tip sizes.
  5. Play audio or take a call! Use the multifunction button to control playback and calls.
  6. The earbuds will power off automatically when returned to the case.

Enjoy your new wireless earbuds!

PISEN Flex S1 Wireless Headphones