In switching regulators and switching capacitance converters, an internal oscillator is used to set the switching frequency of the output transistor. The value of the switching frequency will determine some of the external components used in the converter, determine the frequency of the noise produced by the converter, and affect the performance of the converter. Some converters allow switching frequencies to be changed by adjusting the internal oscillator frequency (" frequency adjustment ") or by "synchronizing" the oscillator with an external signal source. In general, by increasing the switching frequency, smaller components (capacitors, inductors) can be used at the converter output stage. This can reduce the efficiency of the converter because it increases switching losses unless higher quality components are used at the same time. High frequency converters with good performance have faster transient response than low frequency converters. If there are multiple converters on a board, it is usually best to synchronize them to a single signal source. This controls the noise generated by the batch and minimizes any possible "beat frequency". This issue is often important for high power converters (e.g. 5W or higher). In many cases, the switching frequency can only be greater than its preset value. The product data sheet will explain the frequency range of this feature.