SansAmp Bass Driver DI (bass preamp). This item is being sold as junk due to defects. --- [Condition/Operational Check] * Bypass sound works normally. * No sound when the switch is turned ON (effect ON). * Crackling noise when adjusting each knob. * Tested with both battery and AC adapter. * Stored at home for about 3 years without use. It is currently in a condition that requires repair or maintenance. --- [Included Items] * Main unit only (Box, manual, adapter, etc. are not included) --- [Important Notes] * Please consider this item for repair, parts replacement, or modification. * Due to being a junk item, returns, refunds, and operational guarantees are not possible. * Please purchase only if you understand the condition. The Bass Driver DI is a standard piece of equipment, making it a popular model for repair, DIY, and research. --- [Other] * Instant purchase OK. * Please comment beforehand if you have any questions.