The H.S. Strut® University™ Box Calling 101 includes the Field Champion Natural Box Call and instructional DVD. The “Silencer Plus” Field Champion Natural box call is a natural-color call that produces hen and gobbler calls. The patented built-in lock restricts sound when walking. Learn how to use box calls with the included 30-minute instructional DVD. Also includes turkey track window decal. The H.S. Video library at H.S. Strut University includes volumes of video dedicated to helping all grades of turkey hunters..... from the beginning freshman to the veteran senior. When it is test time in the field, turkey hunters will be glad they studied at H.S. Strut U.