On my copy, I would describe it as narrow and high: 55 x 25 x 60 (mm, L x W x H when plugged in). The power supply has a 2-pin Euro plug (standard EN 50075), the length is in axis of the 2 plug pins, thus the power supply protrudes to the left or right over a standard power strip and does not block parallel sockets. Provided that the sockets are installed 'crossways', I'll try ASCII graphics:

<-- B -->
_____
/ \
| o | ^
| o | |
| | L
| | |
| | v
\____/

I would attach a photo if it were possible in this answer form ;)