Radiation-proof: Air acoustic tube protect your body by reducing radio waves radiation.
Anti-noise: The Soft plastic earbud fits either left or right ear,deliver a great sound even in noisy places by air acoustic tube.
Tactical Hidden: Transparent acoustic tube earpiece could be invisible by transforming into the surrounding environment.
Two-pin standard diameter: Ear 3.5 mm stereo (top pin). Mic 2.5 mm stereo (bottom pin)
Space of two-pin: 11 mm
Applications:
Relevant personnel: police, military, bouncer, and businessman.
Related sites: nightclubs, bars, paintball, security, restaurants, hotels, airports, casinos, manufacturing plants, conventions, concerts, warehouses, and noisy environments.

https://www.youtube.com/watch?v=8Uyj8ZWf39s