This rugged single-rackspace unit has a large LCD screen so you can see even in the darkest of situations. The ULXD4D can be networked to interact with other receivers to create a cohesive and happy Wireless system on stage. You won't believe the clarity you get out of the 24-bit/48kHz audio signal. Get into digital Wireless with a Shure ULXD4D 2-channel digital Wireless receiver.