HP L2445m 24-inch Diagonal LCD Monitor - Manual (Page 15)

Using the Accessory Rails
The monitor features accessory rails on the rear that can be used to mount optional devices, such as
the HP speaker bar, to attach to the LCD. Refer to the documentation included with the optional device
for detailed mounting instructions.
Figure 3-6 Using the Accessory Rails Feature
ENWW Using the Accessory Rails 9