A quartz watch uses an oscillation of quartz to define the time. The quartz has the propriety of oscillation with a precise frequency when it is stimulated electronically. A crystal oscillator is an electronic circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency. This frequency is commonly used to keep track of time (as in quartz wristwatches), to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers. The most common type of piezoelectric resonator used is the quartz crystal, so oscillator circuits designed around them were called "crystal oscillators". In other words: quartz is a stable vibration that gives regularly impulses. Through the “circuit integer” impulses are given to the wheels of the hands.