I have a pair that I don't use anymore. I'm getting out of fishing so much. These have 2 sets of propellers for each, slow and fast speed. They work great for streamers but I mostly troll bait anymore (sewed smelt ) v They work best like someone said at 2.2 mph or more. I troll bait at .8 to 1.2 mph which isn't fast enough to make the propellers turn.
I'd part with them for $200 plus cost of shipping.