Panasonic RZ S300W Review

  • -Panasonic-RZ-S300W
  • Panasonic-True-Wireless-Earbuds-RZ-S300W
  • Panasonic-True-Wireless-Earbuds
  • RZ-S300W

Quick Points

  • Fit: In Ear
  • Enclosure: Closed Back
  • Connectivity: Wireless
  • Best For: iOS & Android
  • Noise Canceling: No
  • Microphone: Yes


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What Comes Inside The Box

  • Panasonic RZ S300W Headphones
  • Charging Cable
  • 4 X Silicone Ear Tips
  • Charging Case
  • RZ S300W User Manual
  • Warranty Card

Our Score

  • 7.6

Reasons Why You Should Buy Them

  • Panasonic RZ S300W are the small and cheaper "younger brother" of the RZ-S500W headphones with the same matte, textured finish and available in three color options - Deep Black, Dusty White and Mint Green
  • They have a splash-resistant IPX4 rating to manage sweat or adverse weather conditions, which makes them good for outdoor workouts without any worry
  • 6 mm dynamic driver units deliver balanced, pleasant sound quality with solid bass, natural mid-range, slightly boosted, clear treble to keep the energy high during training
  • Integrated touch controls and MEMS microphone allow you to answer/end phone calls, control music playback, adjust volume, skip tracks and connect to Google Assistant, Siri or Alexa
  • These Panasonic True wireless earbuds are small and fairly light, offering a comfortable and secure fit while running or gym workouts without worrying about falling out of your ears
  • Bluetooth 5.0 provides a stable connection (in our test up to 35 meters) even in crowded environments and helps reduce battery consumption
  • They offer brilliant sound isolation as tips of three different sizes help create the perfect seal that blocks most external sounds
  • With the "Panasonic Audio Connect" app you can make some fine adjustments via smartphone, such as EQ adjustments, Bluetooth pairing, skipping tracks, volume adjustment, prioritizing sound quality or connectivity, auto shut on/off, searching for your missing earphones, firmware update and selection of phone’s virtual assistant
  • You will get up to 7.5 hours of battery life on a single charge, another 22.5 hours with the charging case, and there is also a quick charge function that provides an additional 1.5 hours of running time with just 15 minutes of charging
  • Each bud receives its own Bluetooth signal and works independently, so each bud can be used alone in solo mode to listen to music or answer phone calls
  • With the auto-shutdown feature in the app, you can set the headphones to automatically shut down after a few minutes of inactivity to extend battery life

Reasons Why You Should Avoid Them

  • No support for advanced Bluetooth codec such as aptX, aptX HD or aptX LL for better sound quality, these headphones only support AAC and SBC codecs
  • The lack of support for higher quality codecs also causes significant latency while enjoying HD video or game content and are not the best option if you want to use them to watch Netflix or Apple TV
  • When it comes to higher frequency sounds, sometimes they sound a little harsh due to a slight overemphasis on the treble which hurts the overall audio reproduction
  • The plastic charging case is of poor quality, feels brittle, the lid seems to break easily. It is also twice the size of the Apple Airpod's case, and is not easy to put in your jeans pocket
  • The case is not compatible with wireless charging, it means that it cannot be recharged simply by placing on the back of the new high-end Android smartphone such as Samsung S20 Series or on the Qi compatible wireless charging pad
  • Although Panasonic True Wireless Earbuds RZ S300W have Bluetooth 5.0, there is no multi-device connectivity, which means that only one device can be connected at a time
  • The MEMS microphone is good enough to capture vocals for voice commands, the same cannot be said for call quality. People on the other end of the call struggle to hear the voice in a moderately noisy environment
  • They don't have a noise canceling function to filter out low-frequency external sounds, if you want to use your headphones while commuting, we recommend to opt for a higher-end RZ-S500W, which are one of the best noise-canceling earphones on the market
  • There is no ambient/transparency mode that lets some external sounds in, this function is very useful to keep you aware of the surrounding environment while running or cycling on a busy city street


  • The ultra-compact, stylish, comfortable, truly wireless headphones for music, podcasts, calls, smartphone content and more
  • Touch sensor antenna ensures a strong, independent left-right connection for smooth, uninterrupted playback in the most crowded places
  • Premium 6mm driver units deliver dynamic bass and treble tones for clear and powerful sound
  • Elegant, high-quality earbuds designed to easily adapt to the natural contours of the ear canal for a snug, perfect fit
  • High performance MEMS microphone and Labyrinth structure minimize noise for clear call quality in windy places
  • Touch controls for music playback, volume and tracks, answer calls and connection to the voice assistant
  • Up to 30 hours (buds and charging case) of uninterrupted playback on a single charge
  • With an IPX4 splash-proof rating, it can be used safely anywhere and, in any weather
  • Panasonic Audio Connect app to control music playback, adjust volume levels, connect to voice assistant and more
  • Three color options are available for the Panasonic RZ S300W: Black, White and Green

The Specs That Matter


  • Headphone Fit : In Ear
  • Enclosure : Closed Back
  • Weight Gm/Oz : 4 g (0.14 oz)
  • Foldable Design : No


  • Connectivity : Bluetooth
  • Connect Multiple Devices : No
  • On Device Controls : Call, Volume, Play/Pause, Skip Tracks, Voice Assistant
  • In Line Mic & Controls : No
  • Voice Assistant : Google Assistant + Siri + Alexa
  • Companion App : Panasonic Audio Connect App


  • Noise Cancelation Type : No
  • Sound Isolation : Yes
  • Echo Reduction : No
  • Sound Mode : Mono/Stereo


  • Water/Sweat Resistant : Yes
  • Waterproof : No
  • Heart Rate Monitor : No
  • Step Tracking : No


  • Battery Life : Up To 7.5 Hours (Up To 30 Hours With Charging Case)
  • Auto Pause & Play : No
  • Auto Shut-Off : Yes
  • Quick Charge : Charge 15 Minutes = Up To 1.5 Hours Playback

Technical Data

  • Driver Size : 6 mm
  • Driver Unit : Dynamic
  • Magnet : Neodymium
  • Frequency Response : 20 Hz - 20000 Hz
  • Total Harmonic Distortion @ 90 dB : Less than 0.4%
  • Total Harmonic Distortion @ 100 dB : Less than 0.4%
  • Supported Codecs : AAC, SBC


  • Bluetooth Version : 5.0
  • Bluetooth Profiles : A2DP, AVRCP, HFP, HSP
  • Radio Frequency : 2.4 GHz
  • Wireless Range : Up To 10 m (33 ft)
  • NFC : No

Noise Canceling

  • Noise Canceling Adjustment : No
  • Noise Canceling ON/Off Switch : No
  • Atmospheric Pressure Optimizing : No
  • Ambient Sound Mode : No

Audio Cable

  • Audio Cable Length : N/A


  • Microphone Feature : On-board MEMS Microphone


  • Battery : Rechargeable Lithium Polymer
  • Charge Time : 4 Hours
  • Charging Cable : Type-C Cable
  • Battery Indicator : Yes
  • Operating & Storage Temperature : 32°F - 104°F


  • Connection : Wireless
  • Audio : Yes
  • Microphone : Yes
  • Controls : Yes


  • Connection : Wireless
  • Audio : Yes
  • Microphone : Yes
  • Controls : Yes


  • Connection : Wireless
  • Audio : Yes
  • Microphone : Yes
  • Controls : Limited


  • Connection : No
  • Audio : No
  • Microphone : No
  • Controls : No


  • Connection : No
  • Audio : No
  • Microphone : No
  • Controls : No

TV & Home Theater

  • Connection : No
  • Audio : No
  • Microphone : No
  • Controls : No

User Manuals

Service & Support Info

  • Manufacturer's Warranty on Parts : 1 Year Limited Warranty
  • Manufacturer's Warranty on Labour : 1 Year Limited Warranty
  • Contact : Click Here


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