Watches featuring a « sonnerie » complication indicate the hour and quarters by means of hammers hitting bells or gongs which are tuned to different pitches. Chimes were originally made as a means of telling the time in the dark.
Watches featuring a small seconds have a smaller subcounter, usually located at 6h, which indicates seconds.
The power reserve indicator tells you the time the watch will continue to function. It can either be seen on hand winding or automatic watches.