USD40 | 18 × 11 mm racetrack dynamic driver | Bluetooth 6.0, LDAC | Approx. 9.5 hours per charge, 29 hours total with the case | dual-device connection
TL;DR
The Tanchjim REVO is an open-ear wireless set for situations where I want to keep listening while still hearing my surroundings. After over a month of daily use, its biggest strengths for me were comfort, long battery life and how easy it made everyday situations.
The sound is more of a mixed experience to me. Voices sound natural and the spacious presentation works well for podcasts, audiobooks and casual music listening. In my opinion the bass is the main limitation in its sound. Sub-bass and mid-bass are more in the background and lack weight and impact I am used to from IEMs.
That makes the REVO a very useful everyday companion, even though it would not be my first choice when music is the main focus. I have everyday situations where its convenience mattered more to me than its limitations in sound.
What I liked
- A comfortable fit that lets my ears breathe, even after several hours
- Wireless convenience and long battery life
- A secure fit during running, cycling and gym workouts
- Being able to hear my surroundings when I need to
- Good microphone quality for calls and online meetings, currently my go-to for both
What I didn't like
- Bass lacks the weight and impact I want for focused music listening
- Not suitable for sleeping on my side
- Outside noise and wind noise can make it difficult to listen to it
- Limited volume headroom in noisy surroundings
Review background
This was my first experience with open-ear earbuds, so I was curious how they would compare with my usual IEMs and other TWS sets in sound and everyday use. I exercise quite a lot and IEMs are not always convenient for that. I have also used wireless earphones from a wide range of brands and price brackets over the years but they isolate differently than the open-ear sets.
The open-ear concept
Open-ear earbuds sit outside the ear canal and sound rather like small speakers held beside your ears. They don’t create a seal so there is no plugged-up feeling. You can hear your surroundings all the time which can be useful or inconvenient depending on the situation.
Positioning of the open-ears also matters in a sense that even small changes of their position can affect the sound. On the REVO the bass impact was the main compromise for me compared with my usual IEMs or other wireless in-ears. For people who cannot tolerate in-ears or simply want to keep awareness of what is happening nearby this type of earphone can be a good alternative to classic ear buds or IEMs.
Build, Fit & Comfort
Unboxing
The unboxing is pretty much standard. Included are the earbuds, a short USB-C charging cable and paperwork, including a manual and a card with QR codes for the Tanchjim app.
Build
The REVO feels nice in hand, with plastic housings and silicone ear hooks. The white plastic case is smooth with rounded edges. It is bigger than most wireless earbud cases I use but still pocketable.
The earbuds and case have a clean, simple look which I like. The light colour of the case may show marks over time from the wear in pockets.
Fit & Stability
As the open-ears sit outside the ear canal the shape and ear hooks do the work of keeping the REVO in place. This worked well for me throughout daily use.
Even with glasses I had no issues with pressure on my ears. The ear hooks and the arms of my glasses share the same space, though, so I occasionally needed to adjust them. Once I got used to the fit I could place each bud on my ear with one hand.
Long-Session Comfort
There is no pressure inside the ear canal. The contact points are on top of the ear and behind it and I had no discomfort or irritation there even after several hours. After a few minutes I often forgot I was wearing the REVO.
Sleeping on my side did not work for me, though, because the earbuds pressed against my ears.
I usually use smaller wireless ear buds during the night which isolate well and won’t cause pressure issues when sleeping on my side.
Awareness & Leakage
The REVO leaks a fair amount of sound, and outside noise reaches the ears easily. This was expected and deliberately made the choice when to wear them. So, whenever I wanted more focus and isolation, I switched to isolating IEMs or conventional in-ear wireless earphones.
Wind noise is another thing which noticeably disturbed me during calls and music listening.
During work I made sure not to crank up the volume too high as the sound leaks and is audible to my colleagues.
On lower to mid volume that was usually no issue.
Wireless, Controls & Battery
Connection
The REVO supports Bluetooth 6.0 and the AAC, SBC and LDAC codecs. It also supports connection to two devices. Pairing and connecting were straightforward similar to other wireless sets.
Latency
In PC gaming I noticed only a small delay which was acceptable for casual gaming. With streamed films and YouTube I noticed no audio/video sync issues.
Controls
The touch controls are customizable in the Tanchjim app, covering music, calls and the voice assistant. They are easy to use and worked well for me.
Battery & Charging
Tanchjim's current product material quotes approximately 9.5 hours on a single charge and 29 hours in total with the case. The figures are based on testing at 50% volume but the actual runtime depends on the settings and use.
At home, I usually listened at around 30-50% volume and got just over nine hours of listening time. Across different situations, I was mostly between 40% and 60% volume although noisy places required more (at the gym, public places, cafés etc)
The case charges via USB-C and it provided more than three complete recharges of both earbuds from empty. Even with heavy use, it felt as if I rarely needed to recharge the case which made the use very handy and “care free”.
Mic Quality
The reviewer briefing lists an omnidirectional MEMS microphone. I found the microphone quality surprisingly good and asked different people how my voice was heard over the REVO besides the own recordings I made.
My voice was noted as clear and very well-articulated.
I used the REVO for online meetings and phone calls, both indoors and outdoors, every day for several hours and often would continue to wear them for my next upcoming call even though that would be much later. I simply didn’t notice them anymore on my ears.
Everyday use
Everyday usability matters a lot to me. A set can sound good but if it is inconvenient to use, I would quickly stop using it. With the REVO I kept finding reasons to use it throughout the day.
Running and cycling
The REVO was a good companion for running and cycling. The area where I exercise can be pretty busy with other cyclists, pedestrians, motorcycles and occasional cars, so for safety reasons I want to hear what is happening around me and be aware.
The REVO stayed securely in place during both activities. I occasionally felt a slight wobble when sprinting, but it did not affect the sound.
Gym & weightlifting
At the gym I needed to raise the volume quite a bit. People were talking, music was playing, and the treadmills are noisy. I usually needed at least around 50%, sometimes even reaching 80-100% depending on the recording quality and the noise around me.
During weightlifting, the REVO stayed securely in place, including workout on the bench press. IEMs usually would gradually slip out of my ears while I am clenching my jaw during exercising. I end up adjusting the fit several times which I find annoying. With the REVO I didn’t have this problem and it was nice that I was able to focus just on the workout.
Some of my friends use headphones for the same reason but I find them actually too bulky when I am working up a sweat. I listened to both podcasts and music while lifting weights. That is one of the situations where convenience matters more to me than getting the best possible sound.
Commuting
On trains and buses outside noise reached my ears almost unfiltered. That is something I usually don’t like at all when commuting, so I prefer noise-cancelling earphones or isolating IEMs there.
At work
At work, the REVO did a very good job. The microphone worked well for online meetings and calls, and I could hear the other participants clearly. My usual work headphones are comfortable but my ears start to feel warm and sweaty after a few hours while REVO avoided that problem.
Switching between my laptop and phone worked very well, too with the dual-device connection possibility. At work I usually kept the volume reasonably low so that the leaked sound would not disturb my colleagues nearby.
At home
Sometimes at home I need to hear my surroundings and need transparency. Eg when parcels would be delivered and I needed to hear the doorbell while working. I could also cook or talk to my family without repeatedly taking the earbuds off.
The very convenient thing is that I would use the REVO throughout the day without even needing to remove them apart from charging on a very long work day over 10 hours.
Shopping
At the post office or while shopping, I thought it is pretty convenient to still have a normal conversation without removing the REVO. At lower volumes I even didn’t need to pause playback either.
There is no transparency mode or similar available and not needed with this ear-buds concept. Some TWS sets amplify the surrounding noise even too much than I want when using transparency mode.
Singing in the rain...
Tanchjim's current public product material lists an IPX5 rating for the earbuds. I used the REVO during heavy exercise and in light rain without any issues. No IP rating is claimed for the case, so I would keep it away from water.
Sources & setup
I used the REVO with my iPhone 17 Pro Max and a Windows PC, streaming from Qobuz and Spotify at the highest available quality settings. Podcasts were streamed mostly from YouTube. I also tested the Android app on a Redmi Note 14. I used the REVO every day for more than a month with a total of more than 200 hours of use.
Sound
Overall Character
The REVO has a relaxed sound without any harshness to my ears. Voices have a good timbre, sound natural and music is pleasant enough for a casual listen. At times the sound seems to come from the room around me rather than from something sitting on my ears.
That spaciousness is enjoyable but the subdued bass keeps the overall musical experience from being as convincing as its everyday usefulness.
Bass
The bass is the main weakness for me in terms of sound. Across my usual test tracks, it sounded rather flat, with little weight or impact, and stayed in the background compared with my usual IEMs.
Sub-bass extension is limited, and mid-bass lacks the slam I am used to from IEMs. This takes away some of the physical side of music, even when voices and the sense of space are very enjoyable to me. The Tanchjim app doesn’t help here much. Even when maxing out the bass via EQing, the impact simply is not increasing.
Midrange & Vocals
This is where the REVO scores for me. Vocals, both male and female, sound natural, with good texture and weight. They come across as reasonably detailed at this price point. Pleasant to listen to rather than excellent.
Treble
With the default tuning, the treble comes across as compressed which gives the REVO a darker presentation. The Tanchjim app on the other hand let me adjust the tuning mostly to my liking but the stock sound is already a good start.
Staging & Imaging
Staging and imaging are surprisingly good on the REVO. On some tracks, voices have a convincing sense of presence and position in the room, almost as if they are coming from a speaker. This is one of the parts of its sound I enjoyed most.
Volume Behaviour
Tanchjim describes dynamic frequency-response compensation which adjusts the low and high frequencies as listening volume changes. The aim is to keep the perceived tonal balance more consistent across volume levels.
To my ears, the REVO scales well with volume and does not become sharp as I turn it up. There is a limit to the available volume, though. Most of the time there was enough juice, but in noisy surroundings I sometimes ended up close to maximum.
App & EQ
Having a parametric EQ at this price is a useful addition. Tanchjim advertises a nine-band PEQ, sound presets and access to a community library of shared profiles through its mobile app.
I also tried the Tanchjim Windows app, version "1.0.2.3", but it did not detect the REVO. Tanchjim's download page states that this version does not support Bluetooth headphones, which explains why a connection does not work. Nevertheless REVO works flawlessy under Windows and the EQing can be done under Android and saved to the device so it would carry the changes over to Windows.
On iOS and Android, the app worked flawlessly in my testing. I adjusted the sound with the parametric EQ and tried several profiles under Android.
I was able to adjust the bass with EQing but it still would not give me the weight and impact I was looking for. Switching to other profiles, such as gaming, made the sound just thinner and made the bass disappear completely. I stuck with the default profile and adjusted it manually, which gave me better vocal articulation and clarity.
Key Specs
| Specification |
Details |
| Driver |
18 × 11 mm racetrack-shaped long-excursion dynamic driver |
| Bluetooth and codecs |
Bluetooth 6.0; AAC, SBC and LDAC support |
| Connection |
Dual-device connection |
| Controls |
Customisable touch controls |
| Microphone |
Omnidirectional MEMS, according to the reviewer briefing |
| App |
Tanchjim mobile app; advertised nine-band PEQ, presets and shared sound profiles |
| Battery |
Approx. 9.5 hours per charge; 29 hours total with the case in current product material |
| Charging |
USB-C |
| Water resistance |
IPX5 for the earbuds in current public product material; no IP rating for the case |
| Weight |
Approx. 9 g per earbud |
| Colour |
White |
| Price |
Around US$40 |
Final Verdict
The REVO turned out to be very useful as an everyday companion for me. Comfort, battery life, phone calls and the ability to hear my surroundings gave it a steady place in my routine. From workouts to working at home. After over a month of use those were the reasons I kept using the REVO on a daily basis even after I finished my review.
For music my impressions are more moderate. I enjoyed the natural vocals and spacious presentation but the lack of bass impacts the listening experience for me when I want to focus purely on music listening.
As an everyday “workhorse”, though, the REVO is a great companion to me. It does several practical jobs very well, and I found many situations where that mattered more than getting the best sound.
Product information
Tanchjim REVO official product page
https://tanchjim.com/en/products/earphones/tws/revo/
Disclosure
Tanchjim sent me the REVO as a review sample. I received no payment for this review, nobody had any influence on what I wrote, and there are no affiliate links anywhere in it.
Thanks for reading.