EChip Kits The EChip consists of a small stainless tube with a stainless ball inside and a small electron emitting crystal at the end. In water, the crystal's hypersensitive electrons are activated by any movement or vibration of the ball and tube. The result is a tiny electric pulse being emitted into the water which exactly duplicates the nerve discharge of a wounded bait and attracts predators. The EChip is the world's first microchip for bait. It was invented in the greater Silicon Valley in the late 1990s by the Pro-Troll engineers. It needs no batteries and never wears out. The EChip kits allow you to mount an EChip on any bait or lure. There are two sizes. The small is ½ inch long and the large is ¾ inch long. Kit #2040 contains three small EChips and shrink mounts. Kit #2041 contains one small EChip and mounts. Kit #2043 contains three large EChips and mounts. Kit #2004 contains three large EChips and mounts. Kit #2045 contains six small EChips on sliders that will slide down a leader.