MB1100The MB1100 is a matching box for Furuno LCD sounders. It is used to connect a dual-frequency transducer to an appropriate Furuno LCD sounder. The MB1100 comes with a 10-pin connector already supplied, and so does not require the use of a separate pigtail cable assembly.This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns. Specifications: Type: Misc Box Dimensions: 8"H x 9"W x 12"L WT: 1.5 lbs UPC: 611679304315 Quick Guide (pdf)