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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want the best sound quality for music, movies and gaming, choose Koss Porta Pro Classic; if you need a foldable wired headset with a boom mic and noise reduction for two-way radio work, choose Retevis EHK012. These two are both wired, both fold, and both cost roughly the same kind of money — but they solve completely different problems.
• Koss Porta Pro Classic — biggest strength: Legendary high-fidelity sound, a 15 Hz–25 kHz frequency range, an on-ear open design, and a collapsible frame with a soft carrying case.
• Koss Porta Pro Classic — biggest trade-off: No microphone and no noise control. It's a listening headphone, not a communication device, and the on-ear design lets outside sound in.
• Retevis EHK012 — biggest strength: A boom mic with noise reduction, an adjustable volume knob, and a flexible coiled cable that stretches from 116 cm to 280 cm — built for talking, not for music.
• Retevis EHK012 — biggest trade-off: It only works with K-head 2-pin radios (Retevis, Baofeng, Kenwood and similar) and is explicitly incompatible with Midland and Motorola. Its 20 Hz–20 kHz range is narrower than the Koss.
• Who each pick is for: Koss Porta Pro Classic is for the music lover, gamer, or editor who wants one portable headphone for everything. Retevis EHK012 is for the event crew, photographer, film/TV runner, or warehouse worker who needs to hear and be heard over a walkie-talkie.
The Koss Porta Pro Classic is a listening headphone first and last. Its dynamic drivers cover 15 Hz to 25,000 Hz — the widest range in this comparison — and Koss built its reputation on that deep bass, crisp highs and strong midrange. It's an on-ear open design, which means it breathes, it stays light, and it doesn't seal you off from the room. For music, movies, editing sessions and gaming on a 3.5 mm jack, this is the tool the design was made for.
Portability is the other half of the story. The frame collapses, and Koss includes a soft carrying pouch, so it disappears into a bag pocket between sessions. The headband is adjustable and uses ComfortZone temporal pads, which is exactly the kind of detail you appreciate on a long flight or a four-hour editing block. The 60 ohm impedance and 3.5 mm plug mean it plays nicely with laptops, phones, handheld consoles and controllers without an amp.
Who should buy it: anyone who wants one pair of headphones for music, media and games, values a retro 80s look, and wants a collapsible frame that travels. Who should skip it: anyone who needs to talk, not just listen. There's no mic, no noise control, and the wired 3.5 mm connection isn't going to pair with a radio. If two-way communication is the job, this isn't the headphone for it. The limited lifetime warranty is a genuine long-term point in its favour.
The Retevis EHK012 is a communication headset through and through. The boom mic is flexible, the noise reduction is designed for loud environments, and the volume knob sits on the side of the headset so you can nudge the level up or down without digging into the radio. The maximum sound threshold is around 82 dB, and the frequency range runs 20 Hz to 20,000 Hz — plenty for voices, not tuned for critical music listening. This is an over-ear design with a rounded earpiece and soft sponge padding.
The fit is deliberate. Retevis notes the headband is built to stay put and may feel slightly snug at first before loosening up with short-term use, and the company recommends seating the ear cup fully over your ear rather than resting it on top — that's how you get both comfort and the noise isolation the design promises. The cable is a strong coiled wire, 116 cm unstretched and 280 cm stretched, which covers different heights and lets you move without yanking the radio off your belt. When you're done, the ear cup rotates and the whole thing folds flat into a bag.
Compatibility is the make-or-break detail. The K-head 2-pin connector fits Retevis RT21, H-777H, RT68, RT68H, RT22S, H777S, RB29, RT86, RB26H, RT22 and MateTalk B4, plus Baofeng UV-5R, BF-F8HP and BF-5RM, plus Kenwood walkie-talkies. It is not compatible with Midland and not compatible with Motorola. Check your radio before you commit.
Who should buy it: photographers directing a shoot, event and sports staff, film and TV production crews, racing game marshals, industrial and campus teams — anyone who talks on a radio all day in noise. Who should skip it: anyone who wants to listen to music, and anyone whose radio isn't a K-head 2-pin model.
Side-by-Side: Which Should You Choose?
• Best for music and media → Koss Porta Pro Classic. 15 Hz–25,000 Hz, dynamic drivers, open on-ear tuning built for bass and midrange.
• Best for talking on a radio → Retevis EHK012. Flexible boom mic, noise reduction and a volume knob on the headset.
• Best for casual everyday listening on a phone or laptop → Koss Porta Pro Classic. Standard 3.5 mm plug, 60 ohm impedance, no radio needed.
• Best foldability for a commute bag → Koss Porta Pro Classic. Collapsible frame plus an included soft case keeps it protected in a pocket or bag.
• Best foldability for a job site → Retevis EHK012. Rotating ear cup folds up small, and the coiled cable stretches 116 cm to 280 cm so you're not tethered tight.
• Best for long sessions → Koss Porta Pro Classic. Adjustable headband and ComfortZone pads are designed for extended wear; the Retevis headband is intentionally snug and needs a break-in period.
• Best for radio compatibility caution → Retevis EHK012. Only if your radio is K-head 2-pin; Midland and Motorola owners should look elsewhere.
• Skip Koss if you need a mic → there is no microphone and no noise control on the Porta Pro Classic.
• Skip Retevis if you want hi-fi → a 20 Hz–20,000 Hz headset tuned for voice won't satisfy a music-first listener.
In my opinion, most people reading this should buy the Koss Porta Pro Classic. It's the more versatile of the two: it plays music, movies, games and editing work on any 3.5 mm device, it folds, it comes with a case, and the 15 Hz–25,000 Hz range is the better-engineered listening experience. I'd only steer you to the Retevis EHK012 if you already own a K-head 2-pin radio and your day revolves around coordinating with a team in noise. If that's you, the boom mic, noise reduction and stretchy coiled cable make it the right tool. If it isn't, the Koss wins. Either way, check the current price on Amazon before you decide — and confirm your radio's connector type first if you're leaning Retevis.
The idea is the same on both of these: rotate or slide the ear cups inward until the headband collapses into the smallest footprint, then store them in a case or bag. The Koss Porta Pro Classic collapses and ships with a soft case; the Retevis EHK012 uses a rotating ear cup that folds up when not in use.
Look for the hinge or swivel point at each ear cup, then turn the cups flat against the headband. Don't force anything past its natural stop. On the Retevis EHK012 the ear cup rotates; on the Koss Porta Pro Classic the frame collapses. Both are designed to fold without tools.
Start with the cable and the hinge, since those are the parts that move most. The Retevis EHK012 uses a strong coiled wire (116 cm unstretched, 280 cm stretched) for durability, and the Koss Porta Pro Classic is backed by a limited lifetime warranty — so if the frame or drivers fail, contact the manufacturer before attempting a repair yourself.
They're headphones whose frame collapses or whose ear cups rotate so they take up less space in a bag. Both products here qualify: the Koss Porta Pro Classic is a collapsible on-ear headphone with a carrying pouch, and the Retevis EHK012 is a foldable over-ear radio headset with a rotating ear cup.
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