A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric materialto create an electrical signal with a precise frequency.This frequency is often 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 ransmitters and receivers. The most common type of piezoelectric resonator used is the quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators,but other piezoelectric materials including polycrystalline ceramics are used in similar circuits. package include : 1x 16.000 MHz 16M Hz Crystal Oscillator SKU: PGI-00249 Category: Electronic Components & IC's