Dartrun has started development to switch on fish that are strongly conscious of the bottom. The biggest drawback of the prototype model at the beginning of development was that it had a very high ability to call fish, but its operability and hooking were poor. However, after spending two years developing it, these difficulties were resolved and it was finally commercialized. Special attention was paid to the "angle of stay posture at the bottom" that raises the hooking rate so as not to give a sense of discomfort to the user and the fish, the "fall speed" that makes it easy to bottom out, and the "fall posture" that reduces line troubles. "Hook position" to improve hooking performance and "dirt performance" to easily move even with light line operation. It will open up a new path as a new method of bottom capture.