There are some known issues. The grille is missing and the volume knob is unstable. However, the unit still works as expected.

Using this Galaxy Audio vocal monitor is easy. Just plug it in and start using it to monitor your vocals. But be careful when adjusting the volume due to the unstable volume knob. Don't apply too much force. As for maintenance, keep it in a dry and clean place. Since the grille is missing, be extra careful not to let dust or small particles get inside the unit. This will help keep it working well for a long time.