This is a small DVR shaped like one of those torches that
fits under a pistol or rifle rails.
This DVR will have an accelerometer, a gyroscope, a light
reflectance sensor, a microphone as well as a camera.
(Optional GPS, or gun safety switch position detection)
Normally, carrying the device
will not do anything.
However it will start buffering a few minutes of sound
and accero/gyro data, on detection of elevated
microphone sound.
It starts fully recording all the sensors, if it detects any
events that indicates that the user has pulled the
gun/rifle out of the holster/sling, and is about to engage
a threat.
This can be by detecting loss of light from reflectance
sensor(out of holster), or by a sharp motion of the
accelerometer(pushed over... or pointing rifle at target),
or sound of gunshots (getting shot at).
It also has a button to start recording anyway, for the
occasional videos at the range that you may want to
stick on facebook.
This product will be useful in situation like home
invasion, or proving that you acted in self defence.
--
The extra sensors will help show extra information such
as 'gun angle' via gyroscope. Number of shots via
Accelerometer. Location via GPS. When safety
disengaged by switch sensor. etc...