The UNO-5003 metal enclosure provides a convenient mounting platform for building an UNO IP based system. It has plenty of room for a battery and additional zone expander modules. In addition to the normal wire knock-outs in the four corners, there is also an additional center knock-out to accommodate the UNO-RF433 module. The lid can be completely removed and easily slid back on for clear access to working on the components inside.