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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want deep in-ear bass with an ultra-fast top-up charge, choose Monster Achieve 100; if you need open-ear awareness, all-day comfort and a longer total battery window, choose Conyat Open-Ear Headphones. These two take opposite approaches to the same problem — one seals sound into your ears, the other leaves your ear canal open to the world — so the right pick comes down to how and where you actually listen.
• Monster Achieve 100 — biggest strength: A bass-forward in-ear design with a 20Hz–20,000Hz dynamic driver, plus a fast-charge claim that gives you roughly 120 minutes of play from a 10-minute charge.
• Monster Achieve 100 — biggest trade-off: It's an in-ear bud, so it blocks your ear canal. Great for immersion, less ideal if you need to hear traffic, training partners or coworkers.
• Conyat Open-Ear Headphones — biggest strength: An open-ear hook design at roughly 6.7g per earpiece, Bluetooth 6.0, IP7 water resistance and up to 40 hours total with the case.
• Conyat Open-Ear Headphones — biggest trade-off: Open-ear means no passive isolation, and its own playtime figures (8–10 hours per charge) are shorter per session than Monster's single-charge claim.
• Who each pick is for: Monster for gym sessions, commuting and anyone who wants deep bass sealed in. Conyat for runners, cyclists and long workdays where staying aware of your surroundings matters more than isolation.
The Monster Achieve 100 AirLinks is built around Pure Monster Sound — a tuning approach the brand says was developed by Noel Lee and the Monster design team. The spec sheet backs the pitch with a dynamic driver covering 20Hz to 20,000Hz, which is a full-range claim and the kind of number that usually signals an emphasis on low-end extension. In plain terms: this is an earbud designed to give you thump.
The battery story is genuinely unusual. Monster says a single charge runs for more than 260 minutes, and the charging case extends that to roughly 1,440 minutes of total listening. That's a long time between wall visits. What stands out more, though, is the fast-charge claim: 10 minutes in the case gets you about 120 minutes of playback. If you're the person who grabs earbuds on the way out the door and realizes they're dead, that single figure is the most useful thing on this page.
Connectivity is Bluetooth 5.0 with a stated range up to 30 meters, plus one-step pairing after the first setup. There's a built-in mic for calls, and Monster says you can run one or both earbuds, which is handy for keeping one ear free. Controls are physical push buttons rather than touch — a real advantage in cold weather or with sweaty hands, since buttons don't misfire the way touch surfaces can.
Buy it if you want a sealed, bass-heavy in-ear bud for the gym, a commute or focused listening, you like physical buttons, and you want to top up in minutes rather than hours. Skip it if you need to stay aware of traffic or surroundings while you listen, or if you dislike the plugged-ear feeling of traditional buds. The water-resistant design covers sweat and weather, and the package includes three SportClips and three sizes of eartips, which helps with fit for different ears.
The Conyat X5S is the opposite philosophy. Instead of sealing your ear canal, it hooks over your ear and leaves the canal completely open. At roughly 6.7 grams per earpiece, it's designed to be barely noticeable — and that's the entire point. You wear these for hours, not for a single intense album.
The practical payoff of that design is situational awareness. You hear your music and the world at the same time. For runners, cyclists, walkers and anyone working in an office where someone might say your name, that's not a gimmick — it's the reason to buy. Conyat pairs this with a 14.2mm dynamic driver and directional sound transmission, which the brand says reduces sound leakage so people nearby aren't hearing your playlist. That's a smart addition, because open-ear designs are notorious for broadcasting.
Bluetooth 6.0 is the newer standard here, and Conyat claims quick pairing and low-latency audio with easy device switching. The earbuds auto-pair when you lift them out of the case. Battery is listed at 8–10 hours per charge depending on volume, extended to a total of 40 hours with the case, and a full recharge takes about 1.5 hours over USB-C. The case also has an LED display showing its battery status — a small thing, but genuinely useful when you're deciding whether to pack the case for a trip.
Calls get an ENC noise-cancelling microphone, which focuses on capturing your voice while filtering background noise — worth noting for video calls and meetings. Controls are touch-based: tap to play, pause, skip, adjust volume or take calls. Water resistance is rated IP7, which covers sweat, rain and intense workouts. Conyat backs it with a 30-day refund window and a 2-year warranty.
Buy it if you run, cycle or train outdoors, you want to hear your surroundings, you wear earbuds all day and hate the pressure of in-ear tips, or you take a lot of calls. Skip it if you want deep, isolated bass, you listen in loud environments like planes or busy trains where you need blocking, or you simply prefer sealed sound.
• Best for bass and immersion → Monster Achieve 100. The 20Hz–20,000Hz dynamic driver and sealed in-ear fit are aimed squarely at low-end punch and isolation.
• Best for situational awareness → Conyat Open-Ear Headphones. The open design keeps your ear canal clear, so traffic, voices and hazards stay audible.
• Best for emergency top-ups → Monster Achieve 100. Ten minutes of charging for roughly 120 minutes of playback is the standout number here.
• Best for all-day comfort → Conyat Open-Ear Headphones. Around 6.7g per hook-style earpiece with nothing inserted into your ear canal.
• Best for total battery window → Conyat Open-Ear Headphones. Up to 40 hours total with the case, with an LED readout so you can see where you stand.
• Best for calls in noisy places → Conyat Open-Ear Headphones. The ENC microphone is explicitly tuned to filter background noise and isolate your voice.
• Best for cold or wet hands → Monster Achieve 100. Physical push buttons beat touch controls when your fingers are numb or sweaty.
• Best for workouts in rain → Conyat Open-Ear Headphones. IP7 water resistance is the stronger rating of the two for sweat and downpours.
• Best for newer wireless tech → Conyat Open-Ear Headphones. Bluetooth 6.0 versus Bluetooth 5.0, with auto-pairing out of the case.
If I had to pick one, I'd take the Conyat Open-Ear Headphones for the way most people actually use earbuds — running, walking, commuting and working with one eye on the world around them. The open design, light weight, IP7 rating and 40-hour case total fit a broader slice of daily life, and the ENC mic makes it the better workday companion.
That said, I'd genuinely recommend the Monster Achieve 100 to a specific listener: someone who wants sealed, bass-heavy sound, physical buttons and a charge that saves them in ten minutes. If your priority is deep in-ear audio rather than awareness, Monster is the one I'd hand you.
It depends on how you measure it. Monster claims roughly 260 minutes per charge with the case extending to about 1,440 minutes total, while Conyat lists 8–10 hours per charge and 40 hours total with the case. Monster's per-charge figure is longer; Conyat's case gives you a clear LED readout of what's left.
For outdoor running, I'd lean open-ear. The Conyat design keeps your ear canal unobstructed so you can hear traffic and other people, and the IP7 rating handles sweat and rain. In-ear buds like the Monster Achieve 100 give you more isolation and bass, which suits a gym or indoor session better than a road run.
No active noise cancelling is listed. The Monster Achieve 100 relies on its in-ear seal and multiple eartip sizes to reduce outside noise passively. The Conyat X5S uses an ENC microphone to filter background noise on calls — that's for your voice, not for blocking sound to your ears.
Value depends on your use case, not just the spec list. If you want immersion, bass and fast charging, the Monster Achieve 100 earns its place. If you want awareness, all-day comfort and a longer case total, the Conyat Open-Ear Headphones do. Check the current price on Amazon for each and match it to the features you'll actually use.
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See also: Monster Open Free AC100 vs coioc Open-Ear Headphones, RoomyRoc Headphones vs Monster Open Ear AC600, rooftree Open-Ear Earbus vs Conyat Open-Ear Headphones