Used infrequently. I checked it before listing, and it worked normally. Thank you. ■ Brand: Xvive ■ Model Name: XV-U2 ■ Color: R (Red) ■ Type: Wireless ■ Maximum Transmission Distance: Approximately 30m ■ Sampling Frequency: 24bit/48KHz Uncompressed Digital Transfer ■ Operating Time: Approximately 5 hours ■ Weight: Transmitter = Approximately 42g, Receiver = Approximately 39g