We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black open-ear earbuds with over-ear hooks and USB-C cable

No Sew

No Sew Resolve ADHF-C191 USB-C Open-Ear Earbuds Small-Medium

SKU CH-0TXX-0XEPT

USB-C wired open-ear earbuds with in-line mic and controls, designed for small-to-medium ears under 2.5 inches

  • TypeOn-Ear
  • ColorBlack
  • THDOpen Ear
  • Input Impedance16 ohms
  • Power Supplyfalse
  • ConnectorUSB
  • Open-ear design keeps you aware of surroundings
  • USB-C wired connection works with iPhone 15, 16, 17 and Android
  • Built-in microphone and in-line controls for clear calls and playback
  • Small-Medium fit suits ears under 2.5 inches
  • Dynamic driver with 16 ohm impedance delivers clear sound

Wide USB-C Compatibility

These Avantree Resolve ADHF-C191 earbuds connect through a USB-C plug and work with iPhone 15, 16 and 17 series, Android smartphones and tablets. The open-ear design keeps the ear canal free so you stay aware of your surroundings while listening.

Sized for Small-Medium Ears

The small-medium fit suits ears up to 2.5 inches in length and replaces in-ear tips that can cause pressure or fatigue after long sessions. Choose the large version instead if your ears measure more than 2.5 inches from top to bottom.

Wired USB-C Limits

The USB-C cable removes the need for charging but tethers you to the device and occupies the port so you cannot charge the phone at the same time. There is no active noise cancellation and the microphone impedance is 16 ohm for basic call clarity.

Highlights

  • Open-ear design keeps you aware of surroundings
  • USB-C wired connection works with iPhone 15, 16, 17 and Android
  • Built-in microphone and in-line controls for clear calls and playback
  • Small-Medium fit suits ears under 2.5 inches
  • Dynamic driver with 16 ohm impedance delivers clear sound

Specifications

BrandAvantree
Series191
ModelResolve, ADHF-C191
Part NumberADHF-C191
TypeOn-Ear
ColorBlack
THDOpen Ear
Input Impedance16 ohms
Power Supplyfalse
ConnectorUSB
Ear Couplingopen_ear
Noise Cancellingnone
Wireless TypeIR
Microphone Impedance16 ohm
Featuresnone, Retractable, Voice Control, touch, Wired, Open Ear, dynamic_driver, 16 ohm

Questions about this item

Will the ADHF-C191 fit ears smaller than 2.5 inches?

The Small-Medium model is designed for ears under 2.5 inches (6 cm) measured top to bottom; the comparison table confirms this fit range.

How do I plug the USB-C connector in correctly?

Insert the USB-C plug fully until it clicks into the port; the in-line controls and microphone only activate when the connection is fully seated.

When should the silicone earhooks be replaced?

Replace the soft silicone earhooks if they lose grip, show tears, or no longer hold the open-ear drivers securely outside the ear canal.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.