No Sew TH9 USB-C headphones white semi-in-ear 120 ohm

What the product is and who it is for

These wired USB-C earbuds use a semi-in-ear design that rests outside the ear canal instead of sealing with silicone tips. They connect directly to phones, tablets and laptops that have a USB-C audio port and no 3.5 mm jack. The built-in DAC handles digital-to-analogue conversion inside the cable. An inline remote and microphone support calls and volume changes without touching the device.

Behaviour under sustained load

The 120 ohm input impedance means the drivers draw very little current from the host, so battery drain stays low during long listening sessions. Sensitivity is rated at -24 decibels and total harmonic distortion is specified for in-ear use, giving a consistent output level that does not drift as the cable warms up. The plastic shell weighs 0.05 kilograms, keeping pressure off the outer ear over hours of wear.

Practical limits of the USB-C audio interface

Audio and power share the same USB-C connector, so the headset only works on devices that implement USB audio class through that port. The cable length is 120 centimetres, which restricts how far you can sit from the source. The single-ear coupling and sound-isolation design do not create a full seal, so very noisy environments will still bleed into the signal. The microphone impedance is approximately 2K ohm with the same -24 decibel sensitivity and SNR figures as the drivers.