How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a marathon battery story with a visible power display and a case that keeps going for days, choose MAcnas Earbuds Open Ear; if you need a lighter, water-resistant pair with a bigger driver, Bluetooth 5.4 and call-focused noise cancelling for workouts and commutes, choose Monster Open Ear AC311.
• MAcnas Earbuds Open Ear — biggest strength: a combined battery picture that dwarfs most open-ear rivals, with 6 hours per charge, a 1.5-hour recharge and a charging case rated for up to 50 hours, plus a dual LED display that shows the remaining power of both the case and the buds.
• MAcnas Earbuds Open Ear — biggest trade-off: no water-resistance rating and no noise cancelling at all, so sweat, rain and loud environments are not what this pair was built for.
• Monster Open Ear AC311 — biggest strength: a 16.2 mm dynamic driver with ENC (Environmental Noise Cancellation) for calls, IPX5 sweat and light-rain protection, and newer Bluetooth 5.4.
• Monster Open Ear AC311 — biggest trade-off: a much shorter 30-hour total playtime and a long 8-hour charge time, with no power display mentioned and no bundled cable listed.
• Buy the MAcnas if battery life, a power readout and indoor-to-outdoor listening are your priorities.
• Buy the Monster Open Ear AC311 if you want a lighter, water-resistant open-ear bud with touch control for calls and training.
The MAcnas Earbuds Open Ear is an ear-clip, air-conduction design with an open structure, so ambient sound stays with you while music plays. That is the whole point of the format: runners and cyclists can hear approaching vehicles or pedestrians, and anyone working in a shared space stays aware of what is going on around them. The angular ear-hook shape and ABS build keep it in the "sporty and functional" camp rather than the fashion-accessory camp.
Where this pair separates itself is power management. The spec sheet lists 6 hours of average playback per charge, a quick 1.5-hour charge time, and a charging case rated for up to 50 hours. The case itself carries a 200 mAh battery and takes about 2 hours to top up, and the dual digital LED display on the outside shows the power level of both the case and the earbuds, with three power levels to read from. In practice that means you can see what's left before you leave the house instead of guessing — a genuinely useful habit if you listen in short bursts across a week.
Who should buy it: people who want the longest possible runtime between wall charges, a visible battery readout, and an open-ear fit for running, gym sessions or desk work. Who should skip it: anyone who trains hard enough to soak their buds, gets caught in rain regularly, or wants active noise cancelling — this model lists no noise control and no IP rating.
Monster Open Ear AC311: Who It's For
The Monster Open Ear AC311 is the more "modern spec sheet" of the two. It runs Bluetooth 5.4 for faster connections and a wider range than the older standard, and it uses a 16.2 mm large dynamic driver to push air-conduction audio — a noticeably bigger driver figure than you'd expect in this category, and the reason Monster talks up rich, full sound. For calls, the ENC (Environmental Noise Cancellation) processing is designed to lift your voice out of busy surroundings, which is the feature that matters most if you take meetings on the move.
The other headline is durability. IPX5 protection means the AC311 shrugs off sweat and light rain, so it suits running, cycling and outdoor training in a way the MAcnas pair doesn't claim to. The open-ear, non-in-ear design is pitched at comfort: nothing pushes into the ear canal, so long listening sessions stay pressure-free, and you keep your awareness of traffic and surroundings. The earpiece is described as "open-ear" in a LightBlack finish, and the charging case is the only accessory listed in the box.
Touch control is the interaction method here too: taps handle answering calls, skipping tracks and adjusting volume, with enhanced sensitivity for snappier feedback so you're not stabbing at the bud repeatedly. Battery life is rated at 30 hours total including the case, with Type-C charging — enough for a solid week of workouts, though the listed charge time of 8 hours is on the slow side.
Who should buy it: people who sweat, train outdoors, take calls in noisy places, and want newer Bluetooth plus water resistance over sheer runtime. Who should skip it: heavy users who hate charging often, or anyone who wants a battery percentage readout at a glance — there's no power display in the specs.
• Best for battery life → MAcnas Earbuds Open Ear. 6 hours per charge with a case rated up to 50 hours beats the AC311's 30-hour total by a wide margin.
• Best for fast recharging → MAcnas Earbuds Open Ear. 1.5 hours to charge the buds versus 8 hours on the Monster, and the case itself refills in about 2 hours.
• Best for battery visibility → MAcnas Earbuds Open Ear. The dual LED display shows case and earbud power across three levels; the AC311 lists no display.
• Best for workouts and wet weather → Monster Open Ear AC311. IPX5 sweat and light-rain protection, which the MAcnas spec sheet does not claim.
• Best for phone calls in noisy places → Monster Open Ear AC311. ENC environmental noise cancellation is built specifically for voice clarity.
• Best for audio hardware and connection → Monster Open Ear AC311. A 16.2 mm dynamic driver paired with Bluetooth 5.4.
• Best for the simplest setup → MAcnas Earbuds Open Ear. The hall-switch auto-pairing opens and reconnects instantly, and the box includes a cable and user manual.
• Best for touch control in general → a tie. Both use touch control for volume, tracks and calls, so the choice comes down to fit, battery and water resistance rather than the control method.
In my opinion, the Monster Open Ear AC311 is the better all-round buy for most people, because IPX5 water resistance, ENC call clarity, Bluetooth 5.4 and a 16.2 mm driver cover the situations where open-ear buds actually get used — workouts, commutes and calls. But if battery life is your single deciding factor, or you want to see your remaining power at a glance, I'd take the MAcnas Earbuds Open Ear without hesitation: a case rated up to 50 hours and a 1.5-hour top-up is a genuinely different ownership experience. Check the current price on Amazon before you commit, since value shifts with whatever each listing is running.
FAQ
Neither the MAcnas Earbuds Open Ear nor the Monster Open Ear AC311 lists an on/off switch for its touch panel in the data sheets, so there is no documented way to disable touch control on either model. If accidental taps bother you, the practical fix is to handle playback from your phone and avoid resting a finger on the earbud.
Because the earbuds are paired over Bluetooth and their touch panel sends commands to the connected device. A tap can pause music, change volume or trigger your voice assistant depending on how your phone maps those inputs. If it's happening unintentionally, it's usually the bud brushing against a hat, hood or helmet rather than a fault.
Not universally — they win on different things. The AC311 gives you IPX5 water resistance, ENC call noise cancellation, a 16.2 mm driver and Bluetooth 5.4. The MAcnas gives you 6 hours per charge, a case rated up to 50 hours, a 1.5-hour charge time and a dual LED power display. Pick by which of those matters most to you.
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See also: NICEXIYAZI Clip-on Earbuds Hybrid vs Monster Open Ear AC310, Fhumsh Earbuds vs Monster Open Ear AC210: Open Ear, Monster Open Ear AC510 vs Xoruezls Open Ear Earbuds