They're for more advanced versions of this:
One works roughly the same, but has a rotary switch to select two different display modes, and a volume knob, and the possibility of a servo to make the antennas move, and the other has four 20 segment led displays like a vu meter that move up and down with straight antennas with leds on the end that will pulsate, and a mode switch to change from bar to dot mode. That one also has a volume control, and plays a kind of drone rather than simple beeps.