cool stuff..courtesy of Bike Rumor

You’ve seen touchscreen, and mapping computers have been around. Now we’ve seen the future.
Cerevellum, a South Carolina based company whose founder also helps design for Blue Competition Cycles has developed a cycling computer with an integrated video camera that displays the footage on the screen as you ride.
The Hindsight 60 is what’s shown here, and it also records footage from the rear facing camera, however it’s only recording eight :30 loops (4 minutes total) and starts rewriting the earliest segment once the memory is full. There’s an accelerometer in it that senses an impact and will stop recording just afterward, so you’ll have the video proof of what led up to any rearward accident.
The cycling computer has all the basic functions (speed, max/avg speed, ride time, distance, odometer, time) and uses GPS to determine speed, so there’s no separate speed sensor. You can, however add an ANT+ cadence sensor to show cadence, or it can pick up cadence from any power measuring cranks that also determine cadence.
If you have a power meter, it graphs power in real time, allowing you view your power output as a graph on the screen, giving you a better visual indication of how long you’re able to sustain a certain output and/or keep yourself at a certain threshold.