WIRELESS SYSTEM ACCESSORY Transport your U4 in-ear monitor with the Xvive CU4, a shock- and waterproof travel case. The case has an internal foam coating that allows you to safely carry a transmitter, receiver and various accessories. CU series carrying cases are made of reinforced EVA, coated with a high-density Oxford cloth exterior. The internal foam coating is custom made for Xvive wireless systems, ensuring optimal conditions for transport.