XVIVE X Vibe U4 In-Ear Monitor Wireless System (Receiver, Transmitter Set) XV-U4. International Buyers - Please Note. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Microphones & Wireless Systems". The seller is "blue-sky-sunflower" and is located in this country: JP. This item can be shipped to United States, all countries in continental Asia, Canada.