Intercom 200 series power supply unit. 

Features:
2 separate audio channels for transmission. 
Channel linking feature to talk on both channels (A+B). 
Supporting up to 30 IC200B belt pack units. 
Front panel connection to link an IC200B belt-pack as a master unit. 
Built-in line and load regulation and short-circuit protection.
Output voltage: DC 28V - 1.1A max.
Connections: 3-pins XLR Neutrik.
Standard rack: 19” single rack unit.
Size (WxHxD): 483x44x190 mm.
Weight: 2.8 kg.