Everything has been tested and confirmed to be working, but please understand the following: 【Condition】 ・No sound from the main unit speakers (sound comes from the speakers of the green ST-75 and one ST-70). ・Playback has been confirmed through all headphone outputs. ・Power operation confirmed only with AC adapter connection. ・Battery box untested (corrosion inside is unknown). Please check the sticky notes attached to the photos for various defects. 【Accessories】 ・Generic adapter → 1 (for operation check) 　※ Not available for all units 【Important Notes】 ・Old model with signs of use on the exterior. ・Due to unconfirmed battery operation and speaker defects, this is a junk item and sold as-is, no returns accepted. 【Recommended for】 ・Parts acquisition, repair base, bulk resale, facility equipment use, etc. It's more advantageous to buy them all together than to sell working units individually. Instant purchase OK, first come, first served!