I bought the dial plate, the dial, extra pendulum, winding key, and glass for the door. The mechanism in the middle right hand side is an alarm. It's an alarm you set and works kinda like a egg timer.
On or off. It has an obnoxious sound as it rings the bell and will get you out of bed real fast. Once out of bed there is no way to shut it off till the spring runs out. Sounds nasty but a lot of these type clocks had them so what the heck.