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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

  • Driver size12 mm Composite Diaphragm
  • Frequency range20 Hz-20 kHz
  • Headphone style=1%
  • Impedance32O
  • Signal-to-noise ratio=95 dB
  • Power supplyBattery

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.

How it compares

Measured against everything we stock in Earbuds & Over-Ear Headphones, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 92% of the 7,078 comparable items (median $25.99).

Specifications

Product
Brand nameTronsmart
Product lineSounfii Series
Model nameSounfii R4
Part number1096447
Product typeEarbuds
Product colorBlack
Performance
Supported distance10m
Audio & video
Driver size12 mm Composite Diaphragm
Frequency range20 Hz-20 kHz
Headphone style=1%
Impedance32O
Signal-to-noise ratio=95 dB
Audio sensitivity105±3 dB
Wearing styleEarbud
Noise cancellationActive
Mic impedance2.2kO
Mic frequency response100 Hz-10 kHz
Mic signal-to-noise ratio=60 dB
Mic sensitivity-42±3dBFS
Connectivity
Wireless technologyBluetooth 5.3
Ports & slots
ConnectionUSB-C
Power
Power supplyBattery
Battery pack28H
Run time28 h (Total) / 7 h (Single)
Charging time3H
Built-in batteryYes
Size & build
Cord length3.3 ft (1.01 m)
Product weight0.099 lb (0.04 kg)
Compatibility
Compatible withiOS, Android, Windows, MacOS
Supported platformsNo
In the box
In the boxTronsmart Sounfii R4 Earbuds, Charging Case, USB-C Charging Cable, 3 Pairs of Ear Tips, User Manual

Other versions of this model

1 more in the same range

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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