I've used this a few times for live performances and rehearsals, but haven't had a chance to use it since, so it's been sitting in storage. I'm selling it now. Power-on confirmation. I've also confirmed that sound comes out through a guitar. I think it's clean with no noticeable scratches or stains, but please consider it as used. [Contents] Main unit Dual USB cable Instruction manual ※Please refer to the photos. Everything is included. [Description] Guitar wireless system, transmitter and receiver, 70 channels, direct plug-in for guitars, electric guitar amplifier, electric guitar, USB rechargeable, no cables required, no interference, power display, convenient to carry. High-frequency delay is less than 3ms, with no delay or signal loss. The effective range is approximately 25M to 40M. The operating time when new is 6 hours, but in my current usage environment, it lasts for more than 5 hours. Transmission range: 25-49m No claims and no returns, please.