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RZ-S300W True Wireless Earbuds

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Stay connected. No matter what.

The S300W true wireless earbuds provide stable connectivity even in crowded areas so you have the maximum comfort when enjoying your content. The minimal and compact design does not get in the way and lets you enjoy your content and conversations wherever, whenever.
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Excellent Call Quality

Six high-performance MEMS microphones are built in a unique labyrinth cabinet structure that can suppress wind noise. Unpleasant noises are reduced and the noise cancelling performance and call quality are improved. With the added beamforming technology, the S300W wireless earphones enable your voice to be efficiently transmitted while suppressing ambient noise.
Excellent Call Quality

Stable Connections Even in Crowded Areas

Say goodbye to brief interruptions to your music or calls, even in crowded places, thanks to the optimised touch sensor and antenna in the S300W wireless earbud’s compact cabinet design, complemented by a Left-Right Independent Signalling System. Enjoy the stable connection you deserve, wherever you are.
Stable Connections Even in Crowded Areas

Unique Antenna Structure

The S300W earbuds' small size was achieved thanks to an integration of our Bluetooth antenna and touch sensor inside the earbud’s control section, while also improving connection stability.
Unique Antenna Structure

Left-Right Independent Signalling System

Relay-type System
Previously, audio data was transmitted in a relay-type form from one earbud to the other. This method consumed more power and was vulnerable to sound interruptions.

Left-Right Independent
The S300W earphones use our new method, where audio data is transmitted from the source to both wireless earbuds simultaneously, ensuring low power consumption and stable connection.
Left-Right Independent Signalling System

Voice Assistant Compatible

Voice assistant smartphone functions such as Siri, Google Assistant™ and Amazon Alexa can be activated by operating the S300W in-ear headphone’s touch sensor.
Voice Assistant Compatible

Maximum 30 hours Playback

Headphones deliver 7.5 hours of playback on a single charge and up to 30 hours of playback with the charging cradle battery.
Maximum 30 hours Playback

Quick Charge

15 min of Quick Charge can deliver 70 min of playback time.
Quick Charge

One Ear Use

The Role Swapping Function enables you to use just one earbud, left or right.
One Ear Use

IPX4 Water Resistance**

The S300W earphones are IPX4-equivalent water resistance**, which means that sudden showers are not a problem.
**Only the headphones are compatible with the IPX4 equivalent. It does not include the charging cradle.
IPX4 Water Resistance**

Ambient Sound Mode

Simply press and hold the earphones’ touch sensor switches to Ambient Sound Mode to capture external sounds while listening to music. By tapping the sensor for two seconds, you can cycle between “Noise Cancelling”, “Ambient Sound” and “OFF.”


Find out more about firmware updates

Ambient Sound Mode

1 Touch Sensor

Various operations are possible with the touch sensor
*Available colours may vary depending on country.
Touch Sensor

2 Mic for Call

High-performance 2 MEMS Mics for clear, high-quality call sound
Mic for Call

3 LED Indicator (Headphones)

LED blinks in blue or red
LED Indicator (Headphones)

4 LED Indicator (Charging Cradle)

LED indicates battery life in 3 steps
LED Indicator (Charging Cradle)

5 Charging Cradle

Compact and lightweight charging cradle features an easy-to-carry design
*Available colors may vary depending on country.
Charging Cradle

6 Charging Cord Socket (Cradle Exterior)

Quickly charge you headphones before going out with an USB Type-C cable
Charging Cord Socket (Cradle Exterior)

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Size and Weight


  • Bluetooth®Bluetooth®
  • alexa built-inalexa built-in
  • Ambient Sound ModeAmbient Sound Mode
  • IPX4IPX4
  • 7.5 hrs of Playback7.5 hrs of Playback
  • 30 hrs of Playback with Cradle30 hrs of Playback with Cradle
  • Quick ChargeQuick Charge
  • Touch SensorTouch Sensor
  • Voice ControlVoice Control
  • Panasonic Audio AppPanasonic Audio App

Stable Connections Even in Crowded Areas

Unique Antenna in a Compact Body

High-Quality Call Sound

Noise Reduction Structure with MEMS Mic

Compact Body with Smart Control

Touch Sensor, Panasonic Audio Connect App


  • Driver Unit (mm)

    • 6 mm (1/4 in)
  • Magnet Type

    • Neodymium
  • Impedance (Ω)

    • -
  • Sensitivity (dB/mW)

    • -
  • Frequency Information

    • Frequency Response (with cord)
      • -
    • Frequency Band (with Bluetooth®)
      • 20 Hz - 20 kHz
  • Control/ Mic

    • Touch sensor / MEMS Mic
  • Playback Time with Battery (AAC)

    • Headphones
      • Approx. 7.5 hours
    • Headphones with Charging cradle
      • Approx. 30 hours
  • Charging Time (25°C/ 77°F)

    • Headphones
      • Approx. 2 hours
    • Charging cradle
      • Approx. 2.5 hours
    • Headphones with Charging cradle
      • Approx. 4 hours
  • Quick Charge (15 minutes, AAC)

    • Headphones
      • Approx. 90 minutes
  • Continuous Communication Time

    • Headphones
      • Approx. 4.5 hours*
        *May vary depending on smartphone.
  • Waiting Time

    • Headphones
      • Approx. 24 hours (Auto power off does not work)
  • Dimensions (W x H x D)

    • Headphones
      • Approx. 17 mm x 17 mm x 28 mm
    • Charging cradle
      • Approx. 74 mm x 39 mm x 30 mm
  • Weight

    • Headphones (one side only: L and R are the same)
      • Approx. 4 g (0.14 oz)
    • Charging cradle
      • Approx. 45 g (1.6 oz)
  • Supplied Accessory

    • USB charging cord: Approx. 0.5 m (1.6 ft)
      (Input Plug: USB A Shape, Output Plug: USB Type-C Shape),
      Earpieces set: XS, S, M, L (M attached)

Advanced Function

  • Bluetooth® Wireless Technology

    • Version
      • 5.0
    • Supported Profiles
      • A2DP, AVRCP, HSP, HFP
    • Codec
      • SBC, AAC
    • Operating Distance
      • Up to 10 m (33 ft)
  • Water Resistance

    • IPX4 Equivalent (Headphones only)
  • Dual Hybrid Noise Cancelling

    • -

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