We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-04 · 6 min read · Independent comparison
If you want to turn a non-Bluetooth TV, console or stereo into something you can listen to wirelessly—especially for Xbox—choose ETFJZZ 6.0; if you need actual open-ear earbuds you wear on your ears with a charging case and all-day battery, choose Monster Open Ear AC520.
• ETFJZZ 6.0 — biggest strength: it's a 2-in-1 Bluetooth transmitter and receiver, so it adds wireless audio to gear that has none (3.5mm AUX or RCA).
• ETFJZZ 6.0 — biggest trade-off: it is not headphones. You still need your own wired or Bluetooth headphones/speaker to actually hear anything.
• Monster Open Ear AC520 — biggest strength: it's a complete listening product — open-ear earbuds with 24H total playtime, a charging case, touch controls and IPX6 water resistance.
• Monster Open Ear AC520 — biggest trade-off: it's a one-piece earbud setup, not an adapter, so it won't inject Bluetooth into an old TV, receiver or car stereo on its own.
• Who each pick is for: pick ETFJZZ 6.0 if your problem is a device without Bluetooth; pick Monster Open Ear AC520 if your problem is finding comfortable earbuds you can wear for hours.
The ETFJZZ 6.0 is best understood as a bridge, not a speaker. It's a small black adapter with push-button controls that runs in two modes. In TX (transmit) mode it takes audio out of a non-Bluetooth TV, PC, gym machine or flight system and beams it to your Bluetooth headphones or speaker. In RX (receive) mode it does the reverse: it pulls music from your phone and pushes it into a wired speaker, car stereo or home system that has no Bluetooth of its own.
The spec that matters most for gaming is latency. ETFJZZ claims its low-latency technology cuts delay by up to 80%, which is the difference between on-screen action lining up with what you hear and the constant "why is the sound behind the picture?" feeling. That makes it a genuinely useful pick if you're chasing the best open ear earbuds for Xbox or any headphones you already own and want to run wirelessly off a TV or monitor. It uses Bluetooth 5.3 and is backward compatible with older versions, and it supports anything with a 3.5mm AUX or 2RCA audio output jack—so check your source device has one of those before buying. It's plug-and-play in spirit, and it carries a 2-year manufacturer warranty.
Who should skip it? Anyone who wants earbuds in the box. This is an accessory. If you don't already own headphones or a speaker to pair it with, it does nothing on its own. And if your TV only has HDMI or optical out with no AUX/RCA, it's the wrong tool.
The Monster Open Ear AC520 is the opposite kind of product: a finished pair of open-ear earbuds you actually wear. They hook over your ears rather than sealing into your canal, which is the whole point of the open-ear category—you keep hearing the room around you. Monster leans into that with a "surround awareness" angle: good for outdoor runners, cyclists, or anyone in an office who needs to catch a colleague's question without pulling an earbud out.
The design is the headline. It's a purple, plastic-bodied set built around a slide-open "handbag" charging case with a removable lanyard, so it doubles as a style object you can clip to a bag. Controls are touch-based rather than physical buttons, and there's ENC (environmental noise cancellation) on the mic side for clearer calls—note that's call clarity, not active noise cancelling, and the spec sheet lists noise control as "none" for listening. Audio comes from a dynamic driver tuned for deep bass and clear highs.
Battery is the practical strength: up to 8 hours per charge and 24 hours total with the case, which recharges in about 2 hours over Type-C. It runs Bluetooth 6.0 with a 10-meter range and low-latency sync for video. Water resistance is IPX6—fine for sweat and rain, though IPX6 is splash/strong-jet resistance, not full submersion.
Who should skip it? If you specifically want an IPX7 waterproof headphone for Xbox, this isn't it—it's IPX6, and it has no jack, so it can't plug into a controller. Also skip it if you need deep noise isolation on a plane; open-ear design means you hear everything. And the warranty is short at 3 months, which is worth weighing.
Side-by-Side: Which Should You Choose?
• Best for adding Bluetooth to an old TV, console or stereo → ETFJZZ 6.0. Its TX/RX modes exist exactly for gear with no wireless built in.
• Best as a complete, ready-to-wear listening product → Monster Open Ear AC520. Earbuds, case, cable and manual all in the box.
• Best for battery life → Monster Open Ear AC520. 24 hours total with the case versus an adapter that has no listening battery of its own.
• Best for workouts and sweaty commutes → Monster Open Ear AC520. IPX6 sweat and rain resistance, open-ear fit that stays put.
• Best for hearing your surroundings → Monster Open Ear AC520. That's the entire open-ear premise.
• Best for people who already love their headphones → ETFJZZ 6.0. It makes the gear you own wireless instead of replacing it.
• Best for style and portability → Monster Open Ear AC520. The slide-open handbag case and removable lanyard are the differentiator.
For an Xbox setup, I'd buy the ETFJZZ 6.0. If your console or TV audio is trapped behind a wired connection and you want to game with your own headphones on, an adapter that transmits audio wirelessly with a low-latency mode solves the actual problem, and the 2-year warranty is reassuring. In my opinion the Monster Open Ear AC520 is the better everyday buy—more complete, more comfortable for long wear, better battery—but it doesn't fix a Bluetooth-less source the way the ETFJZZ does. Match the tool to the problem: adapter for connectivity, earbuds for listening.
For Xbox specifically, ETFJZZ 6.0 is the more relevant pick because it's a transmitter designed to make a non-Bluetooth source wireless. The AC520 is a finished pair of earbuds with no jack, so it pairs with what already has Bluetooth rather than converting a wired source.
No. The spec sheet lists no headphone jack—connectivity is wireless Bluetooth only, with a 10-meter range. That means no plugging into a controller or a 3.5mm port; you're relying on a Bluetooth source.
The Monster Open Ear AC520 carries an IPX6 rating, which handles sweat and rain. ETFJZZ 6.0 has no water-resistance rating listed, so treat it as an indoor/desk accessory and keep it dry.
It comes down to what you're missing. If you need wireless audio from a device that lacks Bluetooth, ETFJZZ 6.0 is the useful spend. If you need earbuds to wear, the AC520 is. Check the current price on Amazon for each before deciding, since neither figure is fixed here.
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