1、[Bone Conduction]: The wireless headphones use bone conduction technology to deliver music through your cheekbones, giving you unparalleled comfort comparing traditional wireless headphones and earbuds. 2、[Open Ear Design]: The bone conduction headphones has open ear design, you will not feel ears uncomfortable after long time wearing, and will not interfere with your glasses and hats. 3、[Ensure Safety]: The open ear headphones will not close the auditory meatus, or even touch the auditory meatus, you can listen to music while hearing pedestrians, passing vehicles and other sounds, to ensure your safety when running, cycling, walking, exercise, etc. 4、[Build in 16GB Memory]: The waterproof headphones have 16GB of internal memory and can store about 4,000 songs, can be used as MP3 players, listening to music while swimming or in the shower. 5、[IP68 Waterproof]: The bluetooth headphones are IP68 waterproof, which can effectively prevent sweat and rain, you don't need to worry about the failure of the headphone due to sweat when doing sports. Item Type: Bone Conduction Headphones Material: ABS Product Model: K9 Memory: 16GB Bluetooth Version: V5.0 (the connection is 32.8-49.2ft away from accessibility) Operating Band: ISM Band (2.402-2.480GHZ) Compatible Sound: MP3 WAV FLAC APE Battery Capacity: 250mAh Lithium Battery (included) Waterproof Class: IP68 MP3 Function: Support MP3 Local Music Playback Function 1 x Bone Conduction Headphones 1 x Charging Cable 2 x Charging Port Covers 1 x User Manual