What is the device on the shelf in the center of the image?
The device is a speaker.
    src        edge_attr  dst
0     0  to the right of   11
1     1  to the right of    2
2     2   to the left of    1
3     3  to the right of    9
4     4  to the right of   13
5     6   to the left of   12
6     7  to the right of    9
7     9   to the left of    3
8     9   to the left of   12
9     9   to the left of    7
10   11               on    7
11   11   to the left of    0
12   12  to the right of    6
13   12  to the right of    9
14   13   to the left of    4