I put them on and they stay on through all the movements I make, the sound is good enough to hear my timer, and music.
The device failed my expectation. I give 2 stars for responsiveness of the support team.
Principle of bone conduction
Sound waves travel directly to the inner ear through the vibration of the skull without passing through the eardrum, which is also one way people hear their own voice, called bone conduction. When you eat a cookie, you can hear the cracking sound because the vibration is transmitted to the inner ear through the teeth and skull.
Nank AF All-shock Directivity Technology
Nank adopts AF full shock directivity technology, which directly increases the effective vibration area of the vibrator (sounding unit), so as to subvert the traditional bone conduction headphones and improve the sound quality and volume without affecting the pitch sensitivity and earphone wearing comfort. It allows users to obtain a more advanced and comfortable sound quality experience.
More importantly, the all-shock directivity technology breaks through the years-old technical bottleneck of mediocre sound quality caused by traditional bone conduction alone relying on vibrators to produce sound, and has unprecedented technical advantages in terms of quality performance, vibration experience, and scalability.
OT Leakage Reduction 5.0 Technology
OT leakage reduction 5.0 technology Developed in-house by NANK Acoustic Lab, the OT Leakage Reduction Technology 5.0 continues with its full-coverage design while incorporating advanced nano-level driver isolation and high-polymer vibration-absorbing materials. This technology precisely isolates the driver from the outer shell, reducing vibration transfer pathways and significantly diminishing shell vibrations. The technology also employs counteracting sound waves to cancel out leakage, reducing external sound by up to 95% and eliminating the embarrassment of sound leakage.
Nank 4th ResoVibe™ Technology
The patented technology Nank use includes the Nank 4th ResoVibe™ Technology, which represents a breakthrough innovation as well as the leading technical level of bone conduction acoustic technology industry. Based on the previous generation of Resonant Technology, the vibration is reduced by 35%. The efficiency of the vibrator is improved by the more refined structural stacking and sound field reproduction, thus goes up to over 70%. Due to these improvements, the overall sound quality of the full frequency band is able to surpass 90%, providing a clearer and more accurate music experience.