UGREEN USB External Stereo Sound Adapter 15cm – Black | CM129 40964

The UGREEN CM129 USB External Stereo Sound Adapter is a compact 15cm plug-and-play USB sound card that instantly adds dedicated 3.5mm audio output and microphone input to any computer, laptop, or USB-enabled device — with physical volume control, independent mute buttons, dual headset support, and LED status indicators. Powered by the SSS1629 audio chipset delivering 48KHz/16-bit CD-quality audio at ≥85dB SNR across a 20Hz–20KHz frequency range — the CM129 is the straightforward solution for users whose device lacks a 3.5mm audio jack, or who want to bypass a poor-performing onboard sound card.

THREE AUDIO PORTS — HEADPHONE, MICROPHONE, AND COMBO

The CM129 provides three independent 3.5mm audio ports on a single adapter:

- Green port (Output 1): dedicated 3.5mm headphone/earphone output — connects standard headphones, earphones, or desktop speakers

- Red port (Output 2): dedicated 3.5mm microphone input — connects a standalone 3-pole microphone independently of the headphone output

- 4-pin CTIA Combo port (Output 3): single 3.5mm port supporting 4-pole CTIA headsets with an integrated microphone (iPhone-style headset connector) — the correct port for modern smartphone headsets used with a PC

The three-port layout covers every standard audio device connection scenario without adapters — PC headsets, standalone headphones + external microphone, and smartphone headsets with built-in mic all connect directly.

PHYSICAL VOLUME CONTROL + INDEPENDENT MUTE BUTTONS

A dedicated external volume knob provides precise analogue volume adjustment without touching keyboard shortcuts, system settings, or application volume sliders — rotate to adjust output volume in real time. Two independent mute buttons provide instant audio control:

- Headphone/earphone mute: silence audio output instantly without disconnecting

- Microphone mute: mute the mic input for privacy during calls, streams, and recordings — without physically disconnecting the microphone

Physical hardware controls respond immediately — no software lag, no system volume dependency — providing the fastest, most reliable audio control available from a USB sound adapter at this price point.

LED STATUS INDICATORS

Two LED indicator lights display real-time working status:

- Headset LED: confirms active headphone/earphone output

- Microphone LED: confirms active microphone input — immediately visible mic status for call and streaming use where knowing whether the mic is live matters

DUAL HEADSET SUPPORT — TWO HEADSETS SIMULTANEOUSLY

The CM129 supports simultaneous connection of two headsets through its multiple audio ports — useful for sharing audio during a presentation, gaming session, or media playback with another person without requiring a headphone splitter.

SSS1629 CHIPSET — 48KHz 16-BIT, ≥85dB SNR, 20Hz–20KHz

The SSS1629 smart noise-reduction chipset delivers CD-quality audio performance:

- 48KHz, 16-bit sampling: CD-standard audio fidelity for music, voice calls, gaming audio, and multimedia

- ≥85dB Signal-to-Noise Ratio: clean audio signal with minimal background noise or hiss

- 20Hz–20KHz frequency response: full human hearing range coverage for accurate audio reproduction across bass, midrange, and treble

The SSS1629's built-in noise reduction processes the audio signal before output — reducing the electrical interference and ground noise that budget USB sound adapters without a dedicated chipset introduce. Cleaner audio than onboard laptop sound cards that share PCB space with electrical components generating interference.

PLUG AND PLAY — NO DRIVERS, INSTANT OPERATION

The CM129 is a true plug-and-play USB audio class-compliant device — recognised automatically by Windows, macOS, and Linux without downloading or installing any drivers. Connect to any USB-A port and the operating system detects the CM129 as an audio device within seconds. Hot-swap supported — the CM129 can be connected and disconnected while the computer is running without restart.

INSTANT AUDIO UPGRADE FOR ANY USB-A DEVICE

The CM129 solves audio limitations on:

- Laptops without a dedicated headphone jack (or with a single combo jack that limits separate headphone + mic use)

- Desktop PCs with noisy onboard audio that introduces static, hum, or electrical interference

- Gaming consoles with a USB port for audio output

- Thin-and-light ultrabooks that have removed the 3.5mm port

- Any computer where the onboard audio quality is insufficient for calls, streaming, gaming, or music production at this entry level

15CM CABLE — COMPACT, PORTABLE, TRAVEL-READY

The 15cm cable keeps the CM129 close to the USB port without excess slack — appropriate for fixed desk use where cable management matters. The PVC + ABS construction and compact 74 × 34 × 15.5mm body make it portable and easy to include in a laptop bag or travel kit.

KEY SPECIFICATIONS

- Model: UGREEN CM129 / 40964

- Input: USB 2.0 Type-A Male

- Chipset: SSS1629

- Output 1: 3.5mm Green (headphone/earphone)

- Output 2: 3.5mm Red (microphone)

- Output 3: 3.5mm CTIA 4-pin combo (mic + headphone)

- Sampling Rate: 48KHz, 16-bit

- Signal-to-Noise Ratio: ≥85dB

- Frequency Response: 20Hz–20KHz

- Volume Control: External physical knob

- Mute Buttons: Yes — independent headphone + mic mute

- Dual Headset: Yes

- LED Indicators: Yes — headset + microphone status

- Hot-Swap: Yes — plug and play, no drivers

- Cable Length: 15cm

- Material: PVC + ABS

- Dimensions: 74 × 34 × 15.5mm

- OS: Windows, macOS, Linux

- Colour: Black

- Warranty: 2-Year UGREEN Limited Warranty