Hello, Mavic wireless computer, plus the magnet sensor integrated into front wheel skewer. The front skewer quick release should fit road bike, or old non-disc mountain bike.
All you need to do is add a magnet onto your front wheel, then you are all set.
Feature:
Clock,
current, average and max speed,
trip and daily distance, total distance
lap time
Both the sensor and computer take coin cell battery C2032, super easy and slick
One thing missing the bike mount, which I just use a double sided tape with velcro
Since the computer is very light weight, it holds up very securely
Please feel free to ask questions