A transmitter or receiver is designed to work within a particular range of frequencies reserved by your government for remote control model use. Within that band, a frequency synthesizer or crystals are used to select the particular radio channel that the system uses. Equipment from one band must not use crystals from another.
It used to be that equipment would sometimes be sold as either 'high band' or 'low band', depending on which end of the frequency band it could use channels from; modern equipment is much better, and this is no longer necessary.
Depending on your government, some bands may be more suitable than others. For example, in the UK, the 35MHz band is explicitly reserved for model aircraft, hopefully reducing the risk that your aircraft will be shot down by an inexperienced user. Using foreign equipment that uses frequencies not designated by your government can at best lead to the loss of control of a model from local legal use of that frequency, to criminal prosecution at worst.
Most current equipment uses frequencies in the VHF (Very High Frequency) band, typically somewhere between 30MHz---80MHz. However, equipment that uses the 2,4GHz microwave/ UHF (Ultra High Frequency) band is becoming increasingly common, and has the advantage that it selects frequencies automatically, and the use and extent of the band is generally accepted internationally.
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