If you want an open-ear Bluetooth headset with longer combined battery life and IPX6 water resistance for a call center, choose Monster Open Ear AC336; if you need bone-conduction audio and a lightweight frame that leaves your ears open, choose Gelecek Bone Conduction Open-Ear.
For desk calls, Monster’s stated ENC call feature and charging case make it the more practical fit on paper.
Gelecek is the more specific choice for people who want to hear audio through bone conduction while staying aware of nearby sounds.
• Monster Open Ear AC336’s strength: up to 21 hours of total playtime with its case, Bluetooth 6.0, ENC clear-call features, and IPX6 water resistance. Trade-off: its stated seven hours per charge is shorter than Gelecek’s stated ten hours.
• Gelecek Bone Conduction Open-Ear’s strength: bone-conduction audio, a 29-gram titanium frame, and up to ten hours of playtime. Trade-off: its listed IP55 rating is below Monster’s IPX6, and the sheet does not specify a charging-case total.
• For call-center-style desk work: Monster is the more relevant match because ENC is specifically described for calls, though neither sheet establishes call-center certification or performance.
• For outdoor awareness: Gelecek’s bone-conduction approach is designed to keep the ears open while audio plays.
• Choose Monster if you want a conventional open-ear hook design with a case-backed battery figure; choose Gelecek if bone conduction and its light frame matter more.
Monster Open Ear AC336 is an open-ear Bluetooth headset with a hook-shaped earpiece, touch controls, and 13 mm drivers. Its open fit avoids a tight seal inside the ear canal. That may appeal if you dislike the feeling of in-ear earbuds or want to keep your ears uncovered while listening. The product information also describes a shape-memory hardshell material intended to help the earbuds hold their fit.
For calls, Monster lists ENC clear-call technology, described as filtering background noise so the speaker’s voice can be heard more clearly. That makes it the more straightforward candidate here for someone comparing a wireless headset for call center work, remote meetings, or a mix of calls and music. Bluetooth 6.0 and a stated connection range of up to 33 feet offer some room to move away from a paired device, although an open-ear design does not isolate you from office conversation or other nearby sounds.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-19 · 8 min read · Independent comparison
Who should skip it: Skip Monster if bone-conduction audio is your priority, or if you need more than seven hours from the earbuds themselves before using the case.
Gelecek Bone Conduction Open-Ear: Who It's For
Gelecek takes a different route: it uses bone-conduction drivers to deliver audio through the cheekbones, with the ears left open. The product is presented for people who want to listen while remaining aware of their surroundings. That design may be appealing for running, cycling, commuting, or other situations where hearing nearby activity matters. It is not the same listening method as Monster’s open-ear hook earbuds, so buyers should decide which style they prefer rather than treating the two as identical.
Its listed frame is titanium and weighs 29 grams. The product information describes the frame as flexible and able to withstand bending and stretching without deformation. Those details point toward an option for people who value a light, sports-oriented headset they can wear during movement. Gelecek lists up to ten hours of battery life, Type-C fast charging, Bluetooth 5.4, and a built-in microphone for hands-free calls and remote video conferences.
Who should skip it: Skip Gelecek if you want Monster’s stated ENC call feature, a stated charging-case total, or the higher listed water-resistance rating.
• Best fit for a call center or meeting-heavy day → Monster Open Ear AC336. Its ENC feature is specifically described for clearer calls. The data does not establish how it performs in a particular office, so treat this as a feature-based match rather than a guarantee.
• Best for bone-conduction listening → Gelecek Bone Conduction Open-Ear. It sends audio through the cheekbones rather than relying on Monster’s open-ear earbud design.
• Best for a stated total battery figure including a case → Monster. The listed total is up to 21 hours, with up to seven hours on a single charge.
• Best for longer stated playback before accounting for any case → Gelecek. It lists up to ten hours, compared with Monster’s seven hours per charge.
• Best for a lightweight frame with a specified weight → Gelecek. Its titanium frame is listed at 29 grams.
• Best for the higher listed water-resistance rating → Monster. It is specified as IPX6; Gelecek is listed as IP55. Because the rating formats differ, this is a comparison of the labels provided, not a claim that the devices were tested in identical conditions.
• Best for Bluetooth 6.0 → Monster. Gelecek lists Bluetooth 5.4. Both are wireless Bluetooth options, but the version alone does not tell you how either will behave with your particular devices.
• Best for choosing based on ear-fit style → Gelecek for bone conduction; Monster for open-ear hooks. Their designs differ enough that comfort preference may outweigh a small feature comparison.
First, think about what you need to hear. Both products are open-ear designs, but Gelecek explicitly uses bone conduction, while Monster uses hook-shaped open-ear earbuds. If the point is to avoid putting an earpiece inside the ear canal, both may be worth considering; if you specifically want cheekbone-based audio, only Gelecek fits that description. Neither product sheet claims sound isolation, so an open design should not be treated as a way to block a noisy workplace.
For call-center use, pay attention to the distinction between a stated feature and a proven outcome. Monster names ENC for clearer calls. Gelecek mentions noise-cancelling hands-free calls and remote meetings. Neither sheet provides call-quality measurements, workplace compatibility details, or a guarantee that either headset will suppress a particular background sound. If your day depends on a particular calling platform or desk setup, confirm compatibility needs before deciding.
Battery descriptions also measure different things. Monster gives both a per-charge figure and a total that includes the case; Gelecek lists up to ten hours but no case-based total. If you can recharge between work sessions, the single-charge figure may matter most. If you want a case to extend use during the day, Monster provides the clearer stated total. Both mention Type-C charging, while Monster additionally specifies a ten-minute quick-charge figure.
Finally, consider your environment. Monster lists IPX6, and Gelecek lists IP55, but the labels are not identical formats. Both are positioned for active use, yet neither sheet supplies a detailed account of what protection means for every exposure scenario. For a workplace, the bigger practical question may be whether an open-ear headset helps you remain aware of colleagues and surroundings—and whether that openness is suitable for the noise level where you work.
I would choose Monster Open Ear AC336 for a call center or a workday split between calls and general listening.
Its stated ENC feature, touch controls, Bluetooth 6.0, and 21-hour case-inclusive battery figure make the more complete desk-use case for me.
Gelecek is the more compelling pick if bone conduction, a 29-gram titanium frame, and ten hours of listed playback are your priorities.
For my call-center-focused choice, Monster is the one I would buy, while keeping in mind that the open design will not isolate workplace noise.
FAQ
Gelecek lists up to ten hours of battery life. Monster lists up to seven hours on a single charge, plus up to 21 hours total when its charging case is included.
No. Gelecek specifies bone-conduction drivers that send audio through the cheekbones. Monster uses open-ear hook-shaped earbuds with 13 mm drivers and does not describe its audio as bone conduction.
Monster is listed as IPX6, while Gelecek is listed as IP55. The ratings use different labels, so the specifications alone do not establish an exact like-for-like comparison for every kind of exposure.
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