What is the device to the left of the container that looks clear?
The device is a speaker.
    src        edge_attr  dst
0     2  to the right of    3
1     2               on   18
2     3   to the left of   18
3     3   to the left of   11
4     3  to the right of   19
5     3   to the left of    2
6     4   to the left of    9
7     4   to the left of    6
8     6  to the right of    4
9     6   to the left of   12
10    9               on    5
11    9  to the right of    4
12   10   to the left of   14
13   10   to the left of   17
14   11  to the right of    3
15   12       sitting on   13
16   12  to the right of    6
17   14  to the right of   10
18   17               on    1
19   17  to the right of   10
20   18  to the right of    3
21   19   to the left of    3
22   19               on    8