0 .. 9 / A .. Z Keypad for entering numeric data. Press button repeatedly for character input (works like SMS text input).
GHz Key for terminating numeric data entry (frequency in GHz or level in -dBm).
MHz Key for terminating numeric data entry (frequency in MHz or level in dBm).
kHz Key for terminating numeric data entry (frequency in kHz or relative level in dB).
Hz Key for terminating numeric frequency entries (in Hz).
ESC Quits / cancels current editing operation.
ENTER Terminates data input from keypad.
BACK Moves cursor back (delete) one character in editing operations.