better sound volume level than shokz open run 2, slightly louder than the aftershokz aeropex, but not as good sound quality when wearing ear plugs as shokz/aftershokz offerings.
sore to wear for more than a few hours. moveable speakers works well and helps cut outside noise. would be good if it opened a little wider.
difficult to find buttons even though the middle button is raised, would have been better if play pause was in a different location to the skip song buttons
charge speed and battery life are great. charger works ok, aftermarket adaptors can be finicky.
fast to connect to bluetooth.
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.