Answer:
RFID spectrum
Step-by-step explanation:
A frequency band is considered to be interval bound in the frequency domain and has a lower and upper frequency, this means that it is adjustable. Channel width are setting for wifi-routers and access points and are adjustable from 20mhz to 40mhz to 80mhz, depending on the band frequency. Channel selection is used when setting up your network and is adjustable. RFID spectrum on the other hand are not manually adjustable, and are only three types; low, high, or ultra-high.