This is a YAMAHA A100a power amplifier. It is suitable for use in a wide range of professional environments such as stores, studios, and installed sound systems. ⚙️ Condition: Used. 【Operational Check】 Power on has been confirmed. (Supplement) Due to the nature of used equipment, we cannot guarantee sound output from all channels, the normal function of volume and terminals, or output according to specifications. Please purchase only if you understand audio equipment. The exterior may have scratches, scuffs, rack mount marks, and dirt associated with normal use. Please check the images. Accessories are not mentioned, so this item is being sold with the main unit only. (Please check for the presence of a power cable.) ⚠️ Important Notes: Returns and exchanges are not accepted after purchase. Please understand that this is old, used equipment before purchasing. For detailed specifications, please refer to https://jp.yamaha.com/files/download/other_assets/3/323023/A100AJ.pdf