The 3M PELTOR Tactical Earplug helps protect your hearing, and can help improve situational awareness and communications in challenging environments. Integrated with state of the art level dependent technology, the TEP 200 helps provide hearing protection in noise and situational awareness in quiet environments. Ear pieces also include a small antenna to allow audio signals to be received wirelessly from a neck loop accessory (not included). The ear pieces are rechargeable via Micro USB or 3-AA Alkaline Batteries.