Review of Panasonic's Bluetooth wireless earphones (RZ-S30W) and the bad out of Chinese earphones purchased so far

update Last updated: December 17, 2020 at 2:57 PM

Until now, Bluetooth wireless earphones have used cheap Chinese earphones (prices are around 4,000 to 5,000 yen), but it was still cheap or bad, so we decided to buy Panasonic wireless earphones (Panasonic RZ-S30W) this time.

The specifications I want are canal type, that left and right earphones can communicate independently to avoid out of sound, that there is a call function with a built-in microphone, that a wide range of band sounds from bass to medium sound and treble can be produced, charging cable adopts type C, has battery capacity, and is hard to break.
In addition, it is best if there is a noise cancelling function, but if so, it seems that the price will increase by about 10,000 yen plus.

From,Search by the above criteriaAnd, the specification and the review of each product were referred to from the search result.

As a result, we selected Panasonic's new product "Wireless Stereo Inside Phone RZ-S30W (released on February 26, 2020)" with an emphasis on Cospa. (Purchased at price dot com for 12,980 yen)

There were also standard Sony options (such as the WF-XB700), but there was also a slight anxiety that the Sony timer would activate and break in a short period of time, so I removed Sony from the options. 😅

As a result of the investigation, Panasonic was a latecomer compared to manufacturers such as Sony and BOSE in this field, but it was found that it was surprisingly smaller and lighter than Sony and surpassed Sony in specs, taking advantage of its subsequent benefits.
Therefore, we decided to purchase panasonic products with confidence in the future and expectations for the future.

RZ-S30W Review

First of all, from the ceremony of opening ...
As follows, the instruction manual for this model (RZ-S30W) is also used as a high-end model RZ-S50W that supports noise cancelling functions.
Two earpieces are included in the XS/S/M (installed)/L size. The charging cable is type C compatible.
Three types of colors are available: green, black, and white, but this time I bought black.

The manufacturer's site is here. Wireless Stereo Inside Phone RZ-S30W

The following are a charging case and Bluetooth wireless earphones. Of all manufacturers, I think that it is the smallest and lightest charger and wireless earphones.

The outline of the product is as follows.
Features and specifications table, summarized in reference to the information from price dot com.

Features of RZ-S30W

  • By adopting a touch sensor antenna, completely wireless earphones that achieve both the performance and miniaturization of Bluetooth antennas.
  • The "left and right independent reception system" that receives the Bluetooth signal left and right earphones at the same time, high stability of the connection, it is hard to interrupt even in crowded places.
  • The compact housing shape of the earplug size realizes the wearing feeling that it is easy to wear and hard to come off even if the ear hole is small. It is equipped with a touch sensor and can be operated comfortably.
  • To make it easier to talk outdoors, it is possible to make calls with clear voice with reduced noise. The call microphone is equipped with a high-performance MEMS microphone, and a labyrinth structure that is less likely to hit the microphone directly by refracting the passage of air suppresses the occurrence of wind noise.

Specification table of RZ-S30W

TypeCanal typeConnection typeBluetooth (Ver.5.0/Class1)
Mounting methodFully wireless (left and right separate)StructureSealed (closed)
Drive systemDynamic typeCharging terminalsCharging case: USB Type-C
Playback frequency band20Hz to 20kHz
* Sony: 50Hz to 8KHz (effective frequency band)
Driver size6mm
* Sony: 12mm
Continuous durationEarphones only ⇒ About 7.5 hours (AAC)
⇒ Charging case included ⇒
About 30 hours(AAC)
*Sony: Earphones per unit ⇒ up to 9 hours
⇒ Up to 18 hours including charging case
Charging timeCharging for about 2 hours and 15 minutes ⇒ Play for about 90 minutes (AAC)
* Sony: about 2.5 hours, charging 10 minutes ⇒ 60 minutes playback
Supported codecsSbc
External sound captureYesSound quality adjustmentYes
Automatic power on functionYesAutomatic power off functionYes
Waterproof and drip-proof performanceIPX4Noise cancellingX
4g (one side)
* Sony: about 8.0g (one side)

"Charging case"
* Sony: 46g
* Sony: Comparison with WF-XB700

Panasonic Audio Connect app

When using RZ-S30W, we recommend that you install the following Panasonic Audio Connect app (for iOS/Android):
I installed the app for Android because I am using Galaxy S9+.
By installing this app, functions such as earphone firmware update, battery level check, external sound control, sound mode switching (bus enhancer, clear voice, equalizer, etc.), and looking for headphones (location information ON is assumed) will be available.

RZ-S30W firmware update

Prior to using the RZ-S30W, it is desirable to start Panasonic Audio Connect and first update the firmware of the connected wireless earphones to the latest version. This allows the RZ-S30W to be used optimally.

Impressions of RZ-S30W (Review at

As a frank impression, there are only new products that were launched with full power from Panasonic, and I think that it is finished in a wireless earphone with a very high degree of perfection.
As follows, I will post a review written on price dot com.

It is a replacement from an inexpensive Bluetooth wireless earphone made in Chinese. I purchased it for 12,980 yen from

At the time of purchase, we also considered the high-end model "RZ-S50W" with noise cancelling function, but after seeing the review that the noise cancelling function is one now, I decided to purchase this product for the time being.

Since it is possible to update the firmware in the app "Panasonic Audio Connect", functional problems will be improved in the future.

It is not as flashy as Chinese wireless earphones, but it is a simple design with a matte texture. Because it is a very compact construction, it does not get in the way even if I put it in the back. I chose black color.

[High-pitched sound quality]
I think that it is an impression enough. The middle sound is also expressed very clearly.

[Bass quality]
Due to the characteristics of the playback frequency band of the driver unit (20Hz to 20 kHz), compared to the earphones connected to the cord (sony MDR-EX155, etc.), it is slightly inferior in terms of heavy bass, but I think that it is sufficient performance in wireless earphones including SONY. However, in the app "Panasonic Audio Connect", if you enable the bass enhancer of the sound mode, the depth of the bass will increase.

M size attached to the product, fits perfectly. Because it is a compact housing shape of earplug size, it is hard to come off.

【External sound blocking property】
The external sound is blocked enough. Touch the touch sensor (R) for about 2 seconds to switch to ambient mode (external sound capture). When ambient is turned on on the train, it is convenient because you can hear in-house announcements. However, since the running sound of the train is also worrisome to hear the zazer, I hope that the ability to suppress those noise will be added in future firmware updates.

【Prevention of sound leakage】
There seems to be no sound leakage to be worried about.

Whether it's a charging case or wireless earphone, it's probably the lightest class among all manufacturers.

Taking advantage of the advantage of the late shot, it was released with fullance from Panasonic, and I think that it is a very well-balanced and good product.
In terms of operability, it is necessary to get used to triple tap, but functionally, it is a part that is not used often, so it does not feel much trouble.
I called home and recorded my answering machine to try out the call function. There was no noise to be worried about, and a very beautiful voice was recorded.
The built-in high-performance microphone provides sufficient performance as a hands-free wireless earphone that can be called.
It is as expected Panasonic, the stability. You are just an honor student!

In the course of time, I would like to consider purchasing the Panasonic RZ-S50W, which supports the noise cancelling function.

* Actually, I want a Technics EAH-AZ70W, but it is 😣 too expensive to buy

2020.12.17 Added
The following firmware updates have been made to improve ambient mode sound quality, disable touch sensor operations in bulk, and more.

🔗 RZ-S30W Firmware Update

Chinese wireless earphones

The following photo shows a Chinese Bluetooth wireless earphone that has been purchased from Amazon so far.

In the order in which you purchased, from the rightAir-tws T8, TWS Sky-Free, TWS-C5Is.
Compared to domestically produced products, Chinese products can check the remaining battery level with LEDs, power can be supplied, and the appearance is flashy, so it is easy to get your hands on it. 😥

Then, it is a bad out immediately.

Air-tws T8was purchased on Amazon on November 21, 2018 for ¥4,980.
The specifications are as follows.

[Equipped with state-of-the-art Bluetooth 5.0 + EDR] Bluetooth Earphone IPX7 Fully Waterproof 95 Hours Continuous Drive Hi-Fi High-Quality 3D Stereo Sound CVC8.0 Noise Cancelling & AAC8.0 Compatible Automatic Pairing With Microphone Full Wireless Earphones Both Ears Left and Right Separation Type Touch Type Microphone Built-in Microphone Built-in Bluetooth Earphones Japanese Voice Presentation Skilled Certified iPhone & Android Compatible

The Air-tws T8 broke in about a year. Here's a list of what was not good.

There are many things that can not be paired, the connection is unstable.
The microphone is useless.
Sound quality is normal
The life of the earphone is one year

Charging case is too heavy
The battery goes up immediately when powered to the smartphone with a USB cable

Cable type B

TWS-Sky-Freewas purchased on Amazon on March 13, 2020 for ¥3,580.
The specifications are as follows.

[2020 evolution version latest Bluetooth 5.0 HIFI high-quality sound] Bluetooth Earphone LED Display Electric Power Display IPX6 Waterproof Fully Wireless Earphone Bluetooth Touch Type Automatic Pairing With Large Capacity Charging Case Latest Noise Cancelling Compatible Left and Right Separation Type High Sensitivity Microphone Built-in One Ear / Both Ears Compatible iPhone / iPad / Android Application (Black)

TWS-Sky-Free has just been purchased, so I'm still using it, but I'll list the bad points below.

Battery is too bad.
The function of the microphone is a decoration, it is not useful at all.
Sound quality is normal

TWS-C5I purchased it on Amazon on March 29, 2020 for 4,980 yen, but the trouble was discovered and I returned it.
The specifications are as follows.

[2020 latest Bluetooth earphone 200 hours continuous drive] full wireless earphone instant connection automatic pairing Hi-Fi high-quality IPX7 full waterproof both ears left and right separated Bluetooth earphone hands-free call noise cancelling AAC compatible Siri compatible Siri wireless charging 3000mAh charge with LED electric power display volume adjustment microphone built-in PSE authentication iPhone / iPad / Android compatible

TWS-C5 is the latest model of TWS, so I was expecting it, but it was not used at all, so I returned it to Amazon.
The following functions were not good.
This model is strangely highly evaluated on Amazon, but since there is "a prize without omission when you write a review" in the booklet that was shipped with the product, the majority of Amazon's reviews seem to be fake.

The bass does not come out at all. When the volume is turned up, the sound cracks.
The microphone is useless.
Charging case is too heavy, too much

Cable type B

The following are Panasonic RZ-S30W and TWS-Sky-Free from left.
Sky-Free can be used somehow in TWS products, but the microphone is not useful at all, so it's a shame that it can't be used as hands-free.
as an experiment. I recorded to the answering machine with the microphone function to the destination, but the sound was drowned out by the noise, and the contents of the recording could not be heard at all.

Above, it was a bad out to Chinese earphones.

Made in China, the quality is different, the hit and miss is large, and there are a lot of defective products and fakes. And we can't expect high quality or perfection in our products.
It may be good for those who want to close their eyes to the quality to some extent, horns, cheap, but there is a possibility that it will be inconvenient during use, or it will break in a short period of time, after all, I think that it will be lost money of cheap shopping.

Everyone will be having a hard time thanks to the Chinese coronavirus, and from now on, why not review the Japanese manufacturer a little more?

I've already learned how to make it in China, so I'll not buy any Chinese appliances in the future!

Thank you very much for reading this time to the end.

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