The Gatekeeper Systems Inc. SMARTMIC System.

Overpowering diesel engines, constant road noise and poor acoustics can create an extremely difficult environment for recording consistently clear audio within a school bus. Recognizing a significant need for improved audio performance industry wide, Gatekeeper Systems Inc. has recently developed a solution that will set a new standard for clarity, consistency and overall performance for audio recording.
When used in conjunction with The NiTRO™ system the SmartMic™ is guaranteed to enhance the quality of audio recording;