$113 Monster Open Ear AC311 Earbuds, BT5.4, 30h

Updated September 29, 2026

Condition: Open Box-Look NEW In Packaging?: Yes Assembly Required?: No Damaged?: Unknown Functional?: Yes Missing Parts?: Unknown Crystal Clear Voice Call: The 16.2mm large driver speaker provides rich air conduction audio, whether you are on the road or in busy environments. The Monster AC311 open earphones with ENC (Environmental Noise Cancellation) technology can enjoy enhanced clarity during phone conversations, ensuring clear and concise calls. Intelligent Touch Design: Simple touch control lets you click to answer calls, switch tracks, or adjust volume without using your phone. Enhanced sensitivity provides quick feedback for a better experience. The open earbuds design makes these earplugs comfortable, stress-free, and safe during intense activities. Waterproof and Sweatproof: These headphones have an IPX5 protection level, can withstand sweat and light rain, and are almost weightless, and comfortable all day long.

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