With a buds-free listening experience, silicone coating and ultra-lightweight design, OpenRun brings you all-day comfort no matter what challenges you take on. Features: - Open-ear bone conduction headphones - Integrated microphone - Bluetooth 5.1, multipoint Controls: 1-button remote, volume control Operating time: 8 hours - Proprietary charging connector (magnetic), 1.5-hour charge, fast charging function (10 min. for 1.5 hours of operation) Frequency range: 20 Hz - 20 kHz Sensitivity: 105 dB