Smart Cast Fish Finder. RF10 Never used. Everything in box including Remote Sonar Sensor. Fish Finder can be used connected to cables on a boat or with batteries. Using it with batteries makes it portable and allows you to fish wherever you like, on land or on a dock or wherever. Batteries were not included when purchased and takes 8 AA's. Batteries have never been installed as it has never been used. The little green sonar sensor is placed on the fishing line, add bait or lure and cast. The green sensor relays a "picture" to the Smart Cast showing the formation of the land under water and any structure or fish. It has a 100 ft. range It has an A-B channel and could be used with a second Sonar Sensor which could be purchased at most sporting goods stores. This was a gift to my husband and we purchased a boat that already had one, so never used it. Box has instructions inside giving information on how to use.