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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-17 · 7 min read · Independent comparison
• Lavifree Headphones — biggest strength: A complete over-ear Bluetooth 5.0 headset with 40 mm drivers, a 3.5 mm wired jack, FM radio, Micro SD/TF playback, a built-in mic, LED lights, and folding earcups — one device covering music, calls and video.
• Lavifree Headphones — biggest trade-off: It's a plastic, playful LED-focused headset with a 20 Hz–10,000 Hz frequency range and no published codec or water-resistance specs, so it's aimed at casual listening rather than critical audio.
• Weatwo USB — biggest strength: A simple, durable 57.5 cm (1.9 ft) USB-A male to RJ9 female adapter that lets a wired or wireless DECT headset meant for a desk phone work on a computer, laptop, PC or Mac.
• Weatwo USB — biggest trade-off: It only does one job. If you don't already own a compatible U10P/RJ9 headset, this cord is useless to you on its own.
• Pick Lavifree Headphones if you want a single affordable wearable headset for music, school, travel and calls.
• Pick Weatwo USB if you already own a Plantronics, Jabra or Sennheiser DECT/wired headset and want to move it onto softphone duty.
The Lavifree headset is a self-contained listening device. Inside each earcup sits a 40 mm dynamic driver, and the pair runs on Bluetooth 5.0 with roughly a 10 meter wireless range. That's enough for walking around a room, doing chores, or moving between a desk and a couch without the signal dropping. If you'd rather not rely on wireless, there's a 3.5 mm jack, so the same headset can plug into a laptop, tablet, TV or older phone with a headphone port. That dual-mode design is the real appeal here — one headset that works with almost anything.
The feature set leans fun and family-friendly rather than audiophile. The earcups have breathing LED lights that pulse with the music, and you can hold the phone button to switch the lights off when you want to stretch battery life. Lavifree rates the battery at about 15 hours of average use. There's also a Micro SD/TF card slot and FM radio built in, which means the headset can play music with no phone or computer connected at all — handy for kids, or for anyone who wants a standalone player.
Comfort looks reasonable on paper: an adjustable headband, soft protein-foam leather earcups, and a folding hinge so it packs down for travel. It weighs 7.2 ounces, which is on the heavier side for a plastic headset but typical for over-ear designs with a battery and lights. The impedance is 32 ohm, so it should be easy enough to drive from a phone or laptop without a separate amp. The frequency range tops out at 10,000 Hz, which is narrower than what dedicated music headphones usually cover — you'll get strong bass and clear vocals, but not the airy top-end detail a studio pair would give you.
Buy it if: you want one headset for casual music, online classes, video calls and travel, you like the LED look, and you value the fallback of a wired jack plus offline SD card playback. Skip it if: you need precise, reference-grade sound, long-haul battery life well beyond a normal day, or a headset you'll mainly use with a desk phone system.
The Weatwo USB is not a headset — it's a 57.5 cm (1.9 ft) adapter cord that turns a USB-A port into an RJ9 phone jack. Plug the USB end into a computer, laptop, PC or Mac, and plug an RJ9 headset into the other end, and your headset can be used on softphone and computer-based calls instead of only on a desk phone. It weighs just 20 grams, so it lives easily in a laptop bag, and the PVC shell is designed to protect the copper conductors inside while providing insulation and enough toughness to survive being coiled up and thrown in a bag repeatedly.
The compatibility list is the important part, and it's specific. This adapter targets U10P-style RJ9 wired headsets and wireless DECT headsets, including Plantronics models like the CS50, CS55, CS351n, CS361n, CS70n, CS540n, CS540, CS530, CS510, CS520, C054 and C052, Jabra models like the Pro 920, GN9125 and GN9120, and the Sennheiser D10 wireless headset. Weatwo also notes that some Plantronics wireless headsets require you to adjust the compatibility button under the headset base before the adapter will work properly. That's a real setup step worth knowing about before you buy.
It also comes with a stated 45-day money-back window and a 1-year guarantee, which is a reasonable safety net for a small accessory. But the honest limitation is that this cord is only useful in one direction: it adapts a phone headset to a computer. It won't turn a USB headset into something a desk phone can use, and it won't do anything for you if you don't already own a compatible headset.
Buy it if: you own a Plantronics, Jabra or Sennheiser DECT or wired RJ9 headset and want to use it for calls on your computer without buying a whole new headset. Skip it if: you don't have a compatible RJ9/U10P headset, or you're looking for something that produces sound on its own.
• Best for listening to music or watching video → Lavifree Headphones. It's an actual audio device with drivers, a mic and a battery; the Weatwo produces no sound at all.
• Best for phone and video calls from a computer → Weatwo USB, but only if you already own a compatible RJ9 headset.
• Best for flexibility across devices → Lavifree Headphones. Bluetooth 5.0 plus a 3.5 mm jack covers phones, tablets, laptops, TVs and older gear.
• Best for offline playback → Lavifree Headphones, thanks to the Micro SD/TF slot and FM radio.
• Best for travel and packing → Weatwo USB on size alone (20 g, 1.9 ft), though the Lavifree does fold.
• Best for battery life → Lavifree Headphones, with roughly 15 hours of average use; the Weatwo has no battery because it needs no power.
• Best for durability in a bag → Weatwo USB. A sealed PVC cord with no moving parts is harder to break than earcups, hinges and lights.
• Best for a specific existing setup → Weatwo USB, because it solves a compatibility problem nothing else on this page addresses.
If I had to pick one, I'd buy the Lavifree Headphones — but only because they stand alone. They play music, take calls, run wired or wireless, and even work without a phone via the SD card slot, which makes them useful to far more people. The Weatwo USB is the smarter purchase for a narrower crowd: someone who already owns a Plantronics, Jabra or Sennheiser headset and wants to reuse it on a laptop. In my opinion, buy the Weatwo only if you can tick that compatibility box; otherwise the Lavifree gives you a complete device rather than a single-purpose cord.
FAQ
Yes, without question. The Lavifree has 40 mm drivers, Bluetooth 5.0, a 3.5 mm jack and a built-in mic. The Weatwo USB is an adapter cord with no speakers, so it can't play audio by itself.
No. It's built for U10P/RJ9 wired headsets and DECT wireless headsets, including listed Plantronics, Jabra and Sennheiser models. Check your model against that list first, and note some Plantronics wireless bases need a compatibility button adjustment.
Yes — I don't publish prices here because they change often. Use the "Check latest price on Amazon" button on this page to see the current cost of whichever one matches your setup.
The Weatwo USB has no battery or moving parts and is built around a durable PVC shell, so there's less to wear out. The Lavifree relies on a battery rated at about 15 hours per charge, which will naturally decline with use over time.
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