Monster Open Ear AC390 Headphones – Bluetooth 6.0, IPX5, 24H Playtime, Ultra-Light Open-Ear Buds

Monster Open Ear AC390: immersive sound without shutting out the world

The AC390 blends high fidelity audio with the practicality of open ear design. The 13 mm PU titanium diaphragm driver produces crisp highs, balanced mids, and punchy bass, letting you enjoy music with a sense of space no matter where you are. The open ear approach means you can stay aware of your surroundings while listening, an ideal balance for urban explorers and active listeners alike.

Whether you are stepping onto a crowded subway, hitting a sunlit trail, or focusing through a busy office, these buds deliver a listening experience that feels dynamic and responsive. The headset sits lightly, and the soft ear hook anchors the buds securely without fatigue, making them suitable for longer sessions during workouts or daily commutes.

Crystal clear calls and ambient awareness

Advanced Dynamic Noise Cancellation helps minimize environmental interference on calls, while the open design keeps you aware of nearby sounds, a useful combination for hands-free conversations in busy environments.

Power that keeps up with your day

With a rotating charging case providing up to 16 extra hours, you can reach a total of 24 hours of listening per charge. A single charge gives up to 8 hours of music, talk, or podcasts, and the case charges the buds when you reconnect.

• 8 hours per charge
• 16 hours from the rotating case
• Total up to 24 hours of playtime

Modern wireless tech and rugged design

Bluetooth 6.0 enables quick pairing and stable connections across devices. IPX5 water resistance protects against sweat and light rain, so you can train, commute, or explore without worrying about splashes or drizzle.

These features come together to support daily routines, travel days, and spontaneous outdoor adventures, offering reliable audio without sacrificing situational awareness.