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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a single dongle that turns a modern iPhone or any USB-C/Lightning device into a 3.5mm headphone jack, choose FUHAYA Apple MFi Certified; if you need to plug two headsets into one audio source so two people can listen and talk at once, choose IIISOGNO 3.5mm. These two products look similar on a shelf—both are short, small audio adapters with 3.5mm on one end—but they solve completely different problems. One is a bridge between a phone that dropped its headphone jack and the wired headphones you already own. The other is a splitter that lets a second person join in. Below I break down what each one actually does, who it fits, and which I'd buy.
• FUHAYA's biggest strength: Apple MFi certification with no error-message pop-up, plus 2-in-1 Lightning/USB-C input and Hi-Fi output up to 48 kHz / 26-bit with noise reduction. It covers an enormous device list, from iPhone 17 and Air down to iPhone 6, plus iPad.
• FUHAYA's biggest trade-off: It's a 1-in adapter with a single 3.5mm port, so it can't share audio between two people, and it's built for Apple/lightning-or-USB-C phones rather than generic 3.5mm gear.
• IIISOGNO's biggest strength: Two TRRS female jacks, each carrying full audio and mic, so two headsets work simultaneously through one male 3.5mm plug—gold-plated connectors, aluminum housing, braided nylon cable.
• IIISOGNO's biggest trade-off: It's a splitter, not a converter. It won't give a jackless phone a headphone port, and mic sharing only works if both headsets use a TRRS plug with a built-in mic.
• Who FUHAYA is for: Anyone with a newer iPhone, iPad, or USB-C device who wants to keep using wired headphones, aux cables, or car audio.
• Who IIISOGNO is for: Couples, friends, or family who want to watch a movie, share a playlist, or take a call together on one phone, tablet, laptop, or PC.
The FUHAYA adapter is, at its core, a compatibility fix. Apple MFi certification is the headline here, and it's not a marketing word—it means the dongle is built to Apple's licensing standard, which is why the brand claims no error-message pop-up when you plug it in. Anyone who has used a cheap uncertified Lightning adapter knows the pain: the phone either refuses it outright or nags you with a "this accessory is not supported" warning. MFi certification is the single most useful spec on this sheet for iPhone owners.
Feature-wise, it's a 2-in-1: the input side handles both Lightning and USB Type C, and the output is a single 3.5mm jack. Inside, FUHAYA says the adapter uses noise-reduction technology and supports up to 48 kHz, 26-bit audio output—numbers that comfortably cover standard music listening and video. The point of that spec is that your audio comes through intact rather than compressed or degraded. The single 3.5mm port is the whole design: plug it into your phone, plug your headphones or aux cable into it, done.
Buy it if you have a jackless iPhone or USB-C device and a drawer full of wired headphones you still love. Skip it if you need two people listening at once, or if your devices are generic 3.5mm sources—this is an Apple-centric converter, not a splitter. One more practical note: FUHAYA backs it with a 36-month warranty and around-the-clock support, which is a longer coverage window than the IIISOGNO's stated 1 year.
IIISOGNO 3.5mm: Who It's For
The IIISOGNO splitter solves a different, very specific problem: two people, one audio source. It's a 1-in, 2-out cable—one male 3.5mm TRRS plug goes into your phone, tablet, laptop, or PC, and two female 3.5mm jacks come out. The detail that matters most is TRRS support: both female ports carry full audio and mic, so two headsets can each get stereo sound and microphone function at the same time. That's what makes it work for shared calls, co-op gaming chat, or watching a movie on a laptop with someone else.
The build is a clear step up from a bare plastic splitter. The connectors are gold-plated, which the brand says cuts down signal loss for clearer sound. The housing is aluminum—lightweight, scratch-resistant, anti-corrosion, and it helps shield the connection. The cable itself is braided nylon, which resists wear and tangling, and it's 1 foot (30 cm) long. That length is the sweet spot for a splitter: long enough to reach two people sitting side by side, short enough that it doesn't become a tangled mess in a bag. It ships as a 2-pack, so you can keep one at home and one in a travel kit, and it's gold in color.
Compatibility is broad in the other direction from FUHAYA. It works with most 3.5mm TRRS devices—phones, tablets, laptops, and PCs—and it also plays nice with plain TRS headphones or speakers, but only for sound. That's an important caveat: if you want the microphone to work, both headsets need a TRRS plug with a built-in mic. A pair of basic stereo headphones will let you share music but not talk.
Buy it if you regularly want to share audio with a second person—date-night movies on a laptop, two-player gaming, a shared call, or language practice with one device. Skip it if you're trying to add a headphone jack to a modern iPhone; that's not what this is, and it won't do it. The 1-year warranty is the trade-off against FUHAYA's longer coverage.
• Best for adding a headphone jack to a newer iPhone or USB-C device → FUHAYA Apple MFi Certified. That's its entire purpose, and MFi certification keeps the experience warning-free.
• Best for two people sharing one device → IIISOGNO 3.5mm. Two TRRS ports, both with audio and mic, is something the FUHAYA simply cannot do.
• Best for wired-headphone purists on Apple gear → FUHAYA. 48 kHz / 26-bit output with noise reduction is aimed squarely at preserving your music.
• Best for shared calls and gaming chat → IIISOGNO. Mic sharing across two headsets is its standout feature; TRS headphones won't get mic support.
• Best for travel and everyday carry → FUHAYA. It's tiny (0.01 kg), and one adapter covers phone, tablet, and car aux. IIISOGNO travels well too, and the 2-pack helps.
• Best for durability-minded buyers → IIISOGNO. Braided nylon cable, aluminum housing, and gold-plated connectors are explicitly wear- and tangle-resistant.
• Best for long-term peace of mind → FUHAYA. A 36-month warranty and 24/7 support beat the splitter's stated 1 year.
• Best for non-Apple setups → IIISOGNO. It works across phone, tablet, laptop, and PC without caring about Lightning at all.
If I had to pick one, I'd buy the FUHAYA Apple MFi Certified adapter. In my opinion, it wins because it solves the more common and more frustrating problem: a modern phone with no headphone jack and a drawer full of wired headphones. MFi certification, 2-in-1 Lightning/USB-C input, 48 kHz / 26-bit output, and a 36-month warranty make it the safer everyday buy for most people. I'd only steer you to the IIISOGNO 3.5mm if sharing audio between two headsets is a genuine, recurring need in your life—in that case it's the only one of the two that can do the job. Check the current price on Amazon before deciding, and match the pick to your actual use case, not the spec sheet.
Yes—the product is described as having passed Apple MFi certification, which is why the brand states there's no error-message pop-up and guarantees compatibility. That certification is the main reason to choose it over a generic dongle for iPhone use.
It will, but only if both headsets use a TRRS plug with a built-in mic. Both female ports carry audio and mic, so two headset users can share a call. Plain TRS headphones will only get sound, not microphone support.
No. The IIISOGNO is a 3.5mm splitter for devices that already have a 3.5mm output—it doesn't convert Lightning or USB-C to 3.5mm. For that, you need the FUHAYA adapter instead.
It depends on the job. If you need a headphone-jack adapter, the FUHAYA is the only one that does it, so it's the better value for you. If you need to share audio between two headsets, the IIISOGNO 2-pack is the better value—and it's the only one that fits that need. Compare current prices on Amazon for each.
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