If you want a receiver so small it disappears into your ear canal and lets you take a call with no visible hardware, choose COOMAX Mini Spy Earpiece; if you need to pull a snapped 3.5mm plug out of a headphone jack before it ruins your device, choose kenddeel Headphone Plug Extraction. These two products share a connector size and nothing else. One is a listening device; the other is a rescue tool. I'm framing this for audiophiles, because that's usually who ends up comparing them — one crowd chasing a discreet in-ear monitor, the other staring at a phone with half a plug stuck inside it. Read the specs before you pick a side.
COOMAX Mini Spy Earpiece vs kenddeel Headphone Plug Extraction at a Glance
• COOMAX Mini Spy Earpiece — biggest trade-off: the audio band is narrow (85 Hz – 255 Hz), the loop transmitter runs on two 9V batteries, and you need a 3.5mm jack or an adapter you supply yourself.
• kenddeel Headphone Plug Extraction — biggest strength: six slim stainless steel tubes built to grip a broken 3.5mm plug from a 0.1mm gap and pull it free from a phone, tablet or laptop jack.
• kenddeel Headphone Plug Extraction — biggest trade-off: it's explicitly a single-use-style consumable set, and it only works if you can seat the tube deep enough alongside the broken plug.
• Who should pick which: go COOMAX if you want hidden, hands-free listening; go kenddeel if your problem is a broken plug, not a missing earpiece.
The COOMAX Mini Spy Earpiece is a genuinely unusual piece of kit. The earpiece itself is about 3 x 2 mm — small enough to sit deep in the canal — and it carries no power source of its own. Instead, a skin-colored loop worn around the neck or under clothing connects to your phone's 3.5mm jack and drives the earpiece across an electromagnetic field, the way a radio signal would. You speak into the phone normally and listen through the earpiece. A small magnet is included for getting it back out, and COOMAX notes that one earpiece is usually enough for clear sound, with a second one available to improve things further.
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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-20 · 7 min read · Independent comparison
What it does best is disappear. There's no headband, no cable to your ear, no blinking LED, nothing for anyone to notice. If you want to hear a call, a feed or a translation stream while your hands are busy and your ears look empty, this is the design that delivers that. The media control is a simple push button on the loop set, and the whole package weighs around 40 g, so it vanishes into a bag or pocket.
The kenddeel Headphone Plug Extraction is a repair tool, and a very specific one. You get six small stainless steel tubes. When a 3.5mm plug snaps off inside a jack, you slide a tube into the roughly 0.1mm gap between the jack housing and the lodged plug — tapping it in lightly if needed — feel it grab, then pinch the end with your fingers or pliers and pull. If the first attempt doesn't clear the whole plug, you repeat with a fresh tube. The set is described as a single-use tool, which is exactly why there are six of them: you get six attempts at the problem.
What it does best is save devices. A broken plug left in a phone, tablet or laptop jack is the kind of small failure that turns into a repair bill, and this kit is built for the person who'd rather spend ten careful minutes than ship anything anywhere. It works across all models of phones, pads and computers with a 3.5mm jack — no brand lock-in, no adapter, no software. The finish is steel throughout, and the whole thing weighs about 0.02 kg, so it lives in a drawer without taking up space.
Who should buy it: anyone with a snapped plug currently blocking a jack, and anyone whose cables fail at the plug often enough that owning the fix makes sense. Who should skip it: if your jack is a different size, if you want a reusable precision instrument, or if you're hoping this does anything for audio quality — it doesn't. It's also honest about its limits. kenddeel points out that there are really only two reasons the tool fails: the tube can't be made thinner, or the plug broke in a way that won't let the tube seat at all. Read the instructions before you start pushing, and note the manufacturer's caution — forcing it is the wrong move.
Side-by-Side: Which Should You Choose?
• Best for total concealment → COOMAX Mini Spy Earpiece. A 3 x 2 mm in-ear receiver on an inductive loop leaves nothing on show.
• Best for hands-free talking → COOMAX Mini Spy Earpiece. You speak into the phone as normal; the loop's push button handles media control.
• Best for battery independence → COOMAX Mini Spy Earpiece. The earpiece itself draws no power. Just remember the loop transmitter needs two 9V batteries, and COOMAX advises removing them after use.
• Best for cross-device compatibility → kenddeel Headphone Plug Extraction. Phones, tablets and laptops with a 3.5mm jack, no adapter required. COOMAX needs a 3.5mm output, or an adapter you buy separately.
• Best for full-range listening → neither, and I mean that. A 85 Hz – 255 Hz band is voice territory. If you want the best headset for audiophiles in the music sense, this earpiece isn't competing in that category.
• Best for a one-time emergency → kenddeel Headphone Plug Extraction. Buy it, use one tube, keep the rest for the next cable that dies in your bag.
• Best for everyday carry → COOMAX Mini Spy Earpiece. Around 40 g, plus a loop that sits under a collar.
In my opinion, most people reading this should buy the kenddeel Headphone Plug Extraction — because if you landed here with a broken plug in your jack, that's an active problem and this kit is the direct answer. I'd choose COOMAX Mini Spy Earpiece only if concealment is the whole point of the purchase. For audiophiles, that distinction matters: the COOMAX is a discreet speech-and-call tool, not a music-first earphone, and judging it as hi-fi will disappoint you. Buy for the job you actually have.
No. The earpiece itself requires no power. The loop transmitter that drives it takes two 9V batteries, which aren't included, and COOMAX recommends removing them after each use.
Treat it as single-use. kenddeel supplies six stainless steel tubes specifically so you get multiple attempts, and the tool is described as single-use by the manufacturer.
It needs a 3.5mm headphone jack, or an adapter that you supply — adapters are not in the box. If your phone has no headphone jack, budget for one before ordering.
There isn't a comparison to make. The kenddeel tool produces no sound at all; it removes a broken plug. The COOMAX covers an 85 Hz – 255 Hz range, which suits speech and simple audio rather than full-range music.
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