Monopusher chronographs are complicated chronographs. Actually the monopusher has three different functions: start, stop and reset.
Chronograph watches can measure and display elapsed time. Usually three subcounters on the dial display the elapsed seconds, minutes and hours.
Watches featuring a retrograde date have their hands moving across a scale which at the end of their cycle, return immediately to zero to start again.
Watches featuring a small seconds have a smaller subcounter, usually located at 6h, which indicates seconds.