Monster Open Ear AC600 Headphones - Open-Ear Bluetooth Earbuds

In this review of the Monster Open Ear AC600 Headphones, the bottom line is simple: these are open-ear, clip-on Bluetooth earbuds built for people who want situational awareness and long battery life without sacrificing clear calls or strong bass. They stand out for a lightweight, ergonomic clip design and Pure Monster Sound driven by 13mm drivers and Qualcomm apt-X decoding, which together deliver HiFi stereo that keeps music detailed while leaving the ear canal open. If you need a comfortable sports-friendly option with ENC for clearer calls, these are worth considering.

Key Features

• Clip-on Design: The ergonomic open-ear clip keeps the ear canal unsealed so users stay aware of surroundings while enjoying music or navigation cues.
• HiFi Stereo Sound: 13mm drivers with Qualcomm apt-X decoding reproduce richer audio detail and stronger stereo separation than typical low-end earbuds.
• Lightweight Comfort: Each earbud weighs only 0.2 oz and uses a non-deforming hard-shell for a stable, long-wear fit during activities.
• ENC Clear Call: Environmental noise cancellation monitors ambient sound and produces opposing signals to reduce background noise for clearer hands-free calls.
• Long Battery Life: Around 7 hours per charge and up to 21 hours total with the compact charging case, plus Type-C fast charge for quick top-ups.
• IPX6 Water Resistance: Designed to resist heavy perspiration and splashes, suitable for running, cycling, and outdoor workouts.

Who It's For

The Monster AC600 is aimed at active users who prioritize situational awareness while listening, such as runners, cyclists, commuters, and outdoor exercisers who do not want sealed in-ear isolation. It is also a good fit for people who take frequent calls and need the convenience of touch controls and ENC noise reduction.

These are less suitable for listeners who want total noise isolation or an in-ear seal for maximum bass impact, or for users who prefer a large variety of ear tip sizes for passive isolation. If absolute studio-level isolation is required, an over-ear or sealed in-ear design would be better.

Pros & Cons

Pros

• Open-ear clip design allows situational awareness during workouts and outdoor use.
• Strong audio detail from 13mm drivers and apt-X decoding for fuller HiFi stereo sound.
• Lightweight construction and secure non-deforming shell for comfortable long wear.
• Good battery life with 7 hours per charge and 21 hours total with the charging case plus fast Type-C charging.

Cons

• Open-ear format limits passive noise isolation, so bass may be less pronounced than sealed earbuds.
• While ENC improves call clarity, very loud environments may still affect microphone pickup.

Specifications

Our Verdict

The Monster Open Ear AC600 Headphones are a strong choice for active users who need reliable sound with full situational awareness and long battery life. They balance comfortable clip-on wear, HiFi stereo detail from 13mm drivers and apt-X, and practical features like ENC and IPX6 protection, making them good value for people who prefer open-ear audio for outdoor activities.

Frequently Asked Questions

Are these suitable for running?
Yes. The clip-on ergonomic design, lightweight build, and IPX6 water resistance make them well suited to running and other workouts.

How long does the battery last with the case?
Expect about 7 hours per single charge and up to 21 hours of combined playtime with the charging case.

Will calls be clear outdoors?
The earbuds use ENC to reduce ambient noise and improve call clarity, though extremely loud environments can still affect microphone pickup.