A mechanical watch employs a mechanical movement, equipped with a series of moving parts such as a barrel and a gear train. This type of watch is fitted with an escapement, a mechanism that mechanically controls the flow of time, correctly indicating the hours, minutes, etc. A quartz watch incorporates a quartz oscillator, powered by a battery. On receiving a current from the battery, the oscillator vibrates to a pre-determined frequency, which in turn controls the speed at which the hands rotate. Quartz watches are usually more precise.