The only thing small about this call is its stature, standing in at a whopping 3 3/4 inches tall. The Microhen was developed to provide a call that would produce the higher pitch, squeaky sound of a young hen compared to the deeper, raspier sound of an old boss hen. Because of the calls’ unique size it practically drives itself, from its squeaky prissy bottom end to its top end hail call, very little air is required to operate this call. Micro in size gigantic in sound. The Microhen provides a unique different sound that can help full even the wariest call shy birds.