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Black in-ear wireless earbuds in a compact charging case

Tronsmart

Tronsmart Sounfii R4 Earbuds Black 12mm 28H ANC Bluetooth 5.3

SKU CH-0F6Q-Z3HSC

Wireless earbuds with 12 mm drivers, adaptive noise cancellation, Bluetooth 5.3 and 28 hours total battery life

  • TypeEarbuds
  • ColorBlack
  • Driver Unit12mm Composite Diaphragm
  • Frequency Response20Hz-20KHz
  • THD=1%
  • Input Impedance32O

text Sounfii R4

  • 12mm composite drivers deliver deep, balanced bass
  • 4-mic ENC system ensures clear calls in noisy places
  • Adaptive ANC reduces surrounding sound for focused listening
  • 28-hour total playtime keeps music going all day
  • Bluetooth 5.3 provides stable, low-latency wireless connection

Tronsmart Sounfii R4 Earbuds

Tronsmart Sounfii R4 wireless earbuds use 12mm composite diaphragm drivers and Bluetooth 5.3 to deliver balanced sound with deep bass for casual listeners and commuters. Active noise cancellation and quad-microphone ENC keep calls clear in busy environments. The compact in-ear design suits daily travel, office work or light exercise.

28-hour battery with USB-C charging

A 400mAh case provides two extra charges for up to 28 hours total playback, while each bud manages about 7 hours alone. USB-C input and wireless charging support keep power simple without proprietary cables. Power draw stays low thanks to Bluetooth 5.3 efficiency during normal music and call use.

Ergonomic fit with touch controls

ABS construction and three ear-tip sizes give a secure, lightweight seal for long sessions. Smart touch panels handle playback, volume and voice assistants without reaching for a phone. The pocket-sized case slips into a jeans pocket, and the 3.3ft USB-C cable covers desk charging.

Highlights

  • 12mm composite drivers deliver deep, balanced bass
  • 4-mic ENC system ensures clear calls in noisy places
  • Adaptive ANC reduces surrounding sound for focused listening
  • 28-hour total playtime keeps music going all day
  • Bluetooth 5.3 provides stable, low-latency wireless connection

Specifications

BrandTronsmart
SeriesSounfii Series
ModelSounfii R4
Part Number1096447
TypeEarbuds
ColorBlack
Driver Unit12mm Composite Diaphragm
Frequency Response20Hz-20KHz
THD=1%
Input Impedance32O
Signal to Noise Ratio(SNR)=95dB
Power SupplyBattery
Sensitivity105±3dB
ConnectorUSB-C
Ear CouplingEarbud
Cord Length3.3ft
Weight0.099lb
Noise CancellingActive
Wireless TypeBluetooth 5.3
Battery28H
Operating Time28 h (Total) / 7 h (Single)
Charge Time3H
Distance10m
Contains Embedded BatteryYes
Microphone Impedance2.2kO
Microphone Frequency Response100Hz-10KHz
Microphone Signal to Noise Ratio(SNR)=60dB
Microphone Sensitivity-42±3dBFS
CompatibilityiOS, Android, Windows, MacOS
FeaturesBluetooth 5.3, 12mm Composite Diaphragm, IPX4, 35mAh Earbuds / 400mAh Charging Case, 7H Single Playtime, 28H Total Playtime
Windows VistaNo
Package ContentsTronsmart Sounfii R4 Earbuds, Charging Case, USB-C Charging Cable, 3 Pairs of Ear Tips, User Manual

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Questions about this item

How do I pair the Sounfii R4 earbuds with my phone using Bluetooth 5.3?

Open the charging case, hold the touch control on both earbuds until the indicator flashes, then select Sounfii R4 from your device Bluetooth menu.

What parts of the Sounfii R4 will need replacement after extended use?

The ear tips and the integrated rechargeable battery inside each earbud and the 400mAh case will degrade over time.

At what point does active noise cancellation stop working during a long session?

ANC remains active until the earbud battery depletes after roughly 7 hours of continuous use, then the case provides two extra charges.

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