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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-29 · 7 min read · Independent comparison
• Callez RJ9 — biggest strength: A full wired RJ9 headset built for desk phones and call centers, with a noise-cancelling microphone, acoustic shock protection, volume/mute controls and a quick-disconnect cord. Its biggest trade-off is compatibility: it only works with specific landline phones that have a 4-pin RJ9 headset jack, and it will not work with computers or smartphones.
• WHMVPWT Disposable Headphone Covers — biggest strength: A 150-piece pack of single-use non-woven covers that fit most over-ear headphones measuring 8–11cm, making shared headsets more hygienic in high-traffic settings. Its biggest trade-off is that it is an accessory, not audio gear — it adds no sound quality, mic or controls.
• Who Callez RJ9 is for: Agents, receptionists and home-office users who take calls all day on a compatible Polycom, Plantronics or similar desk phone.
• Who WHMVPWT Disposable Headphone Covers is for: Call centers, gyms, schools, libraries, hospitals and airlines that hand headsets between users and want a fresh barrier for each one.
• Bottom line: These two solve completely different problems. One is the headset; the other keeps shared headsets clean. Plenty of call centers would realistically want both.
The Callez RJ9 is a single-purpose tool: a wired over-the-ear telephone headset that plugs straight into the RJ9 headset port on a compatible desk phone. There is no pairing, no dongle, no software. You plug it into the phone and you're on a call. For anyone who spends hours a day on a landline or VoIP handset, that direct-connect simplicity is the whole point.
The specs back up the call-center angle. The microphone is noise-cancelling, so background chatter in a busy room gets pushed down while your voice comes through. There's an acoustic shock protection circuit, which matters more than people realize if you've ever taken a sudden loud spike through a headset. You get volume control and a mic mute switch built into the cord, so you're not reaching for the phone every time you need to go quiet. The quick-disconnect cord lets you stand up and walk to the printer without pulling the headset off your head — a small feature that turns into a big one over an eight-hour shift.
Comfort and build are aimed at all-day wear. It's an on-ear design with a flexible, adjustable headband and a flexible mic boom, with faux leather and plastic construction and a unibody headband. The 150-ohm dynamic driver is a headset-grade spec rather than a hi-fi one — it's built for clear voice reproduction on calls, not music. In the box you get the cable, ear cushions, headband and the QD cord. Callez also backs it with a 2-year worry-free guarantee on top of a 45-day money-back window.
Here's the catch, and it's a real one: compatibility is everything. This headset only works with specific phones that have a 4-pin RJ9 jack — the description lists Polycom SoundPoint and VVX models, Plantronics S10/S11/S12 and similar, plus ShoreTel, Mitel, NEC, Allworx, Nortel, Aastra, Toshiba, Gigaset, InterTel and Siemens handsets. It explicitly does not work with Avaya models like the 1608, 1616, 9608G, 9611G, 9620, 9641G, J139, J169 or J179, and it does not work with smartphones, computers, or anything needing a 2.5mm, 3.5mm or USB jack. If you can't find your exact phone model in the list, contact the seller before buying. Buy it if you live on a compatible desk phone. Skip it if your "headset" needs to plug into a laptop or a cell phone — this is the wrong product entirely.
The WHMVPWT Disposable Headphone Covers solve a different problem: the ick factor of shared headphones. You get 150 single-use covers made from soft, non-woven fabric in white. Each one slips over an over-ear headphone earcup that measures between 8cm and 11cm, which covers most standard over-ear models — including call center headsets, DJ headphones, airline headphones, and the sets handed out in schools, libraries, hospitals and gyms.
The value here is volume plus disposability. In a shared-headset environment, the alternative to a fresh cover is either wiping down cups between users or just handing the same pair to the next person. A 150-piece pack means a reception desk, a gym front counter or a school computer lab can go a long way before reordering, and each user gets their own barrier. The non-woven fabric is the same category of material you'd find in disposable masks and wipes — soft against the ear, light, and designed to be tossed after use rather than washed.
What it is not is a piece of audio equipment. It has no drivers, no microphone, no cable, no controls. It won't improve sound, it won't reduce background noise in the room, and it won't fix a headset that's uncomfortable or broken. It's also a universal-fit accessory, which is convenient but means it's designed to work across many headphone sizes rather than being tailored to one. If your earcups fall outside that 8–11cm range, expect a loose or tight fit. The manufacturer lists a 30-day warranty.
Side-by-Side: Which Should You Choose?
• Best for a complete call-center setup → Callez RJ9. It's the actual headset: mic, controls, cord and comfort in one package.
• Best for shared-headset hygiene → WHMVPWT Disposable Headphone Covers. Fresh barrier per user, 150 in the pack.
• Best for noise control on calls → Callez RJ9. The noise-cancelling mic and acoustic shock protection target call audio specifically.
• Best for high-traffic, multi-user environments → WHMVPWT. Gyms, libraries, hospitals and schools are exactly the settings the covers are built for.
• Best for hands-free movement at your desk → Callez RJ9. The quick-disconnect cord lets you step away without removing the headset.
• Best if you need zero setup → WHMVPWT. No compatibility list, no wiring question — just check your earcup size falls in the 8–11cm range.
• Best if you're on a laptop or cell phone → neither. The Callez RJ9 is landline/RJ9 only, and the covers are just covers.
• Best pairing for a busy call center → both. Use the Callez RJ9 as the headset and the WHMVPWT covers where headsets get passed around.
If I had to pick one, I'd buy the Callez RJ9 — but only after confirming my desk phone appears on its compatibility list, because that single check decides whether it's useful or useless to you. For a single agent on a compatible Polycom or Plantronics handset, it's the more complete purchase: real call audio, a noise-cancelling mic, mute and volume on the cord, and a quick-disconnect you'll actually use.
That said, I don't think these compete. If you run a shared headset pool, the WHMVPWT covers are the smarter buy precisely because they solve the problem the Callez headset can't. In my opinion, a call center setting up properly would grab both — the headset for the calls, the covers for the people sharing them. Check the current price on Amazon for whichever fits your situation before you commit.
Only if your phone has a 4-pin RJ9 headset jack and appears on the compatibility list — many Polycom, Plantronics, Mitel, NEC, ShoreTel and Toshiba models qualify. It does not work with Avaya models like the 1608, 9620 or J179, and it won't work with computers or smartphones.
They're designed for over-ear headphones with earcups measuring 8–11cm, which covers most standard models including call center headsets. Check your earcup size first — outside that range, the fit will be off.
No. It's an RJ9 landline headset only. It has no USB, 2.5mm or 3.5mm connection, so it's a non-starter for softphones and mobile use.
Not at all. The Callez RJ9 is a working telephone headset; the WHMVPWT covers are disposable hygiene accessories for shared headphones. If you need to make calls, buy the headset. If you need to keep shared headsets clean, buy the covers.
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