Those are all timers. Oven times, specifically, if I'm correct. Basically you twist the dial to however much time you want and then let go. Most of them will make a faint ticking type sound as they count down, and when they hit zero they make a noise that is usually loud and high pitched.
The person saying "it's a little too quiet" is implying they want to set off timers just to troll people
The person saying "it's a little too quiet" is implying they want to set off timers just to troll people