Sounder can be used on any Northstar 961, 962, 957, 958, 972, 6000i, 6100i
Dual channel dual frequency 50/ 200 kHz
See Manufactures Site Here for Details
Part Number: 490-D
Condition: In Stock, Ready to Ship! This unit is in excellent physical condition and was removed from a boat that received a total electronics refit. See Photos. Guaranteed in good working order and covered by a 14 day return policy. This listing is only for what is shown in the photos. No other parts or pieces are included.