1) Timer part 
In electronics and technology, a reset button is a button that can reset a device. On video game consoles, the reset button restarts the game, losing the player`s unsaved progress. On personal computers, the reset button clears the memory and reboots the machine forcibly. Reset buttons are found on circuit breakers to reset the circuit. This butt....
[n] - a push button that you press to activate the reset mechanism
noun a push button that you press to activate the reset mechanism
A small button that, when pushed, will restart a Macintosh.