This is the S BOOSTER-Bng from EVA Electronics. ※This model adds a booster function to a 9V stabilizer. From the manufacturer's product specifications: ・It draws a boost curve without compromising the individuality of amplifiers and effectors. ・It maintains the fullness and luster of the sound while lowering the volume of tube amplifiers. ※Please check the URL below for details. The product includes only the main unit. ※Box, manual, adapter, etc. are not included. Operation has been confirmed. ※Manufacturer's product specifications URL (List price: 30,000 yen) https://www.evaemis.com/homepage2011_2/product/s-booster4g.html There are scratches and dirt. It will be shipped by either Takkyubin Compact or Yu-Packet Plus. ※The shipping company may change depending on the situation, but the shipping cost and anonymous shipping will remain the same. I will not answer questions about the serial number other than the part shown in the image. #Effecter #EVA Electronics #Eva Electronics #Stabilizer #Stabilizer #Booster #Booster #EVASBB