It's a 1-bit comparator.
UPPER input button is A.
Lower input button is B.
A,B are inputs.
E,L,G are outputs.
Outputs are:
E means A=B
L means A<B
G means A>B
Truth Table:
A B E L G
0 0 1 0 0
0 1 0 1 0
1 0 0 0 1
1 1 1 0 0
It tells whether inputs are Equal i.e. A=B (1st LED), or A<B (2nd LED) or A>B (3rd LED)
