Please refrain from negotiating the price. Operation has been confirmed. I have performed basic sound checks and verified the operation of knobs and switches. Operation was confirmed using a power adapter. The "BASS" print in the image marked with ⭕️ is damaged (images 3 and 4). Printed materials are also included (image 7). The items for sale are only the main unit; adapters, batteries, and cables are not included. Please only purchase if you understand that this is a used item. It will be shipped via Yu-Packet Plus (dedicated box). BEHRINGER PB100 preamp booster, an excellent effector for improving sound quality. - Brand: BEHRINGER - Model Name: PB100 - Type: Preamp Booster - Input Terminals: 1/4 inch jack - Output Terminals: 1/4 inch jack - Control Knobs: GAIN, MIN, MAX Thank you for viewing.