A New Generation of Air Conduction Headphones： Focus on excelsior craftsmanship & breathtaking experience, Air Conduction No Contact with External, Auditory Canal, Bluetooth 5.0, Stable & Anti-Interference, Waterproof Cope with various Environments, Built-In Battery 5 Hours of Play Time, Anti-Bending Elastic Titanium Alloy Frame, HiFi Pure Surround Stereo, Pair at Boot Quick Connect, Long Distance More Reliable Keep a Distance from, External Auditory Canal More Comfortable When Exercise, By virtue of open-ended air conduction, you can keep alert to the external environment while listening to songs which improve the safety for outdoor sports Air Conduction, Take Care of Your Hearing, The sound is transmitted to the ear through the air. Ho contact with the external auditory canal which reduces the impact on hearing after long-term listening IPX4 Water Repellency, Make Exercise more Comfortable, Comfortable skin-friendly material and fully enclosed sound cavity prevent rain and sweat from permeating High-Capacity Battery, Ultra Long Endurance Powerful upgrade - 5 hours of continuous playback after fully charged 14 hours of battery life. Large-capacity polymer Li-ion battery endows longer endurance, making entertainment and calls more enjoyable to your hearts content Light & Snug 360° Bendable Frame, According to ergonomics, each arc is fully pursued for more comfortable wearing experience User's Guide, Humanized Buttons, Well-designed and arrayed buttons for easy operation with one finger Specification: Chip & Bluetooth Version: 5.0 EDR Impedance: 32 Ω±15% Sensitivity: 84±3dB Frequency Range: 20 -20KHZ Transmission Distance: 10-15 meters SNR: -42dB Battery Capacity: 120mAh (Polymer Li-Ion) Play Time: about 5 Hours (when 80% Volume) Standby Time: 360 Hours Charging Time: 1.5 Hours User Manual: Chinese and English Accessories: Type-A charging cable, user manual Notes: When the battery power is lower than 10%, the earphone prompts: battery low. Long press the power button for 10 seconds, the white and green lights flash alternately. Click the switch button to play / pause music