SlashGear

The Invisio Pro-M promises to transfere your voice and only your voice through its bone conduction microphone. It an in-the-ear headset and was designed for “those who take their communication seriously” such as law enforcement, military and surveillance and intelligence agencies.

It’s ultra light, just under 5grams and only 1.3×2.4cm. You can even the Invisio in a submersible version as well! However, it only goes a depth of 20m.