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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-24 · 6 min read · Independent comparison
• MillSO USB — biggest strength: two TRRS 3.5mm female ports on a single USB plug, so two people can listen from one Windows PC at once. It's the sharing-friendly pick.
• MillSO USB — biggest trade-off: it only plays nicely with TRRS plugs (3 black rings). TRS mics, dual-plug headsets and Apple-standard headphones are out.
• QimKero External — biggest strength: a compact aluminum-shell adapter with a nylon braided cable, and you get two of them, so you can leave one on a desk and one in a laptop bag.
• QimKero External — biggest trade-off: it's a single 3.5mm port per unit, so it can't split one PC across two listeners the way MillSO can.
• Who MillSO is for: households, study partners and anyone who wants two headsets live on one desktop.
• Who QimKero is for: one-person setups that just need a reliable, driver-free headphone jack on Windows.
MillSO's adapter is built around a very specific job: taking one USB port and turning it into two TRRS 3.5mm female jacks. The stated use case is sharing — two sets of headphones or two speakers running off a single computer, whether that's family movie night, two friends studying together, or a partner working alongside you. It also does the simpler job of bypassing a PC's own 3.5mm port when that port is noisy or dead.
Under the hood it uses a built-in smart DAC chip for signal decoding, and it's driver-free and USB bus-powered, so there's no software to install and no wall adapter to hunt down. The listed sample rate tops out at 48 KHz, the channel configuration is listed as surround 5.1, and the signal-to-noise ratio is quoted at 120 dB. The housing is sapphire blue metal — wear-resistant and corrosion-resistant — and the cable is described as 20 strands of three-core enameled copper under a soft PVC jacket with high-density shielding. The USB connector is USB 2.0, and the unit is 12 inches (30 cm) long.
Buy it if you regularly have two people listening at one PC, or you want to replace a flaky onboard audio jack with a metal-bodied adapter that also splits the signal. Skip it if you only ever plug in one headset, or if your gear uses TRS plugs, dual-plug headsets, or Apple-standard headphones — none of those will work here. Also note the compatibility carve-outs: no TV, amplifier, CD player, PS3, Xbox, car or truck.
QimKero's adapter does one thing with less fuss: it adds a single 3.5mm TRRS 4-pole port (mic in plus audio out on one jack) to a USB-A port. It's plug and play, no drivers, no external power. The USB port is an output, not an input — audio only travels from USB to the 3.5mm side, which is worth knowing if you assumed it could capture audio the other direction.
The build is the selling point here. Aluminum shell instead of plastic, nylon braided cable instead of PVC, and a slim 5.9" x 0.58" x 0.29" body that's easy to tuck behind a laptop. The maximum sample rate is listed at 96 KHz — higher than MillSO's — though the quoted signal-to-noise ratio is 20 dB, which is a very different figure from MillSO's 120 dB and worth weighing if clean audio matters to you. Compatibility covers Windows 10/8/7/Vista/XP, Linux, Mac OS X, Chromebook, Raspberry Pi, PS4, PS5 and Surface 3. You get two adapters in the pack, and QimKero backs them with a 19-month after-sale warranty and a quoted 12-hour email response window.
Buy it if you want a spare jack for your own TRRS headset, you like leaving a second one in a bag, or you're running a second audio output alongside your main speakers. Skip it if you need two listeners on one PC, you use a headset with separate headphone and mic plugs, or you rely on in-line controls — pause, play and volume buttons aren't supported.
Side-by-Side: Which Should You Choose?
• Best for two people on one PC → MillSO USB. Two TRRS ports on one USB plug is the whole point of the design.
• Best for replacing a dead onboard jack → either. Both are driver-free and bypass the computer's 3.5mm port, which is the usual reason people buy them.
• Best for higher listed sample rate → QimKero External (96 KHz versus MillSO's 48 KHz).
• Best for the cleaner quoted noise figure → MillSO USB (120 dB versus 20 dB as listed).
• Best for mic users → check your plugs first. MillSO needs TRRS on both ends for mic use; QimKero supports TRRS headsets and mics but drops mic input with Apple, Beats and Bose headphones.
• Best for console owners → either, with caveats. Both list PS4 and PS5 support, and both explicitly rule out PS3, TV, car and truck use.
• Best for Windows specifically → both. Windows 10/8/7/Vista/XP are named on both sheets; QimKero also lists Windows 11, Mac and Android.
For a Windows PC, I'd buy the MillSO USB. Not because it's universally better — it isn't — but because its two-port design solves the problem most people actually have when they go looking for an external sound card: one machine, two headsets, no cable swapping. In my opinion, the metal housing and the far higher quoted signal-to-noise ratio also make it the more reassuring pick for everyday listening. If you're a solo user who wants a spare jack and prefers the 96 KHz figure, the QimKero two-pack is a perfectly sensible alternative — just check your plugs before you commit.
how to connect headphones to windows pc
Plug the headphones into the adapter's 3.5mm port, then plug the adapter into a free USB port. Both picks here are driver-free, so Windows should recognize the device automatically. If you hear nothing, right-click the sound icon in the taskbar and set the USB audio device as your default playback device.
how to connect headphones to pc windows 10
On Windows 10, the same plug-and-play routine applies — connect the adapter, then open the sound settings and choose the USB audio device as output. QimKero's guidance is to double-click the sound icon in the control panel and select the USB audio device as default. MillSO's steps are nearly identical: right-click the taskbar sound icon, then pick your playback device.
how can i connect my headphones to my pc
Check your plug first. If your headset ends in a TRRS plug with three black rings, either adapter will handle it. If it has two separate plugs (one for headphones, one for mic), neither adapter works — both sheets specifically say dual-plug headsets aren't supported. Once you've confirmed the plug, it's a straight USB connection.
how to use headphones on pc
Plug in, let Windows pick up the device, set it as your default output, then adjust volume both in Windows and inside whatever app you're using. For mic use with the MillSO, both plugs going into its 3.5mm ports must be TRRS. Keep in mind the QimKero won't pass through in-line volume or pause/play buttons on your headset cable.
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