This is a set of a 2U half-size rack with a wireless system and tuner. Sound output and device operation have been confirmed, and it can be used without any problems. I was using it as rack equipment for guitar. ■ Product Contents ・REXER Wireless System (B15) ・KORG Tuner PITCHBLACK pro (with adapter) ・2U half rack (no brand) ・9V rechargeable battery, 9V charger (made by TOSHIBA) ・Patch cable (for connecting tuner and wireless) ・Extension cord ■ Points to note ・The battery cover of the wireless receiver is slightly loose. ・Since it was used in live performances and studios, there is a feeling of use, but there is no major damage to the main unit because it was kept in the rack. ・Regarding the 9V battery for the wireless transmitter, a rechargeable battery and charger made by Toshiba are also included, so you can use it immediately. ■ Shipping Since it is a large item, the rack will be wrapped in cushioning material (bubble wrap) and shipped in simple packaging. I hope this product will be a part of your rich guitar life. Thank you for your consideration.