I was using this personally, but I'm selling it because I don't use it often. Operation confirmed. Accessories (box, instruction manual, charging cable, etc.) are all included. The U3C is for condenser microphones. Please note that it is different from the U3. I will pack it and ship it via Takkyubin (courier service). The following is from Sound House, the store where I purchased it: XV-U3C Wireless System for Condenser Microphones ■Specifications ・Operating frequency band: 2.4GHz ISM worldwide ・Latency: Less than 5ms ・Number of channels that can be used simultaneously: 6 ・Frequency response: 20Hz～20kHz ・Maximum transmission distance: Approximately 27m (※The actual transmission distance varies depending on the environment, such as radio wave reflection, interference, and absorption.) ・Operating time: Approximately 3-7 hours (※When fully charged, it varies depending on the power consumption of the condenser microphone) ・Only for use with condenser microphones (※Do not use dynamic microphones or unbalanced-drive devices. The phantom power may cause the equipment to malfunction.) ※(※Do not use dynamic microphones or unbalanced-drive devices. The phantom power may cause the equipment to malfunction.) (※When using "U3C" with some condenser microphones, noise may occur. This noise is caused by the proximity of the "U3C" and the microphone's preamplifier, so it may not be possible to use it normally depending on the microphone's structure.)