Grundig 30GB - Manual (Page 86)

86
Saving broadcasting channel
1.
Press the [A-B] button shortly while listening to the radio.
2.
Channel number is displayed on the LCD panel and current frequency
being received is stored.
Deleting broadcasting channel
Press the [A-B] button long while receiving a stored frequency.
The channel number displayed on the LCD panel is cleared and the stored
frequency being received is deleted.