SB-181 TX Switch BoxThe TX Switch Box SB-181 is specifically made to work with AMEC AIS Class B transceivers, both the 2W and 5W series. With its simple and robust design, silent mode (AIS transmission disabled) can be activated easily. table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Truck Freight: No Oversized: No Owners Manual Url: https://productimageserver.com/literature/ownersManual/114147OM.pdf