Designed by MOJO's Terry Denmon who has called predators for many years large and small dangerous and otherwise on 4 continents and who wanted an electronic predator caller that does what callers need to do. One thing he insisted upon was quality sound saying "It's quality sound that makes the difference".The MOJO Triple Threat E-Caller is a 3-part Complete Calling System that includes all components needed for successful predator calling.