Convergent Hunting Solutions Overseer Closed Reed Jackrabbit Hand Call Green. All that is required is air pressure. Variances in tone and volume are achieved by creating back pressure with your hand. This is a very effective but easy to use call. Specifications for Convergent Hunting Solutions Overseer Closed Hand Call: Manufacturer: Convergent Hunting Solutions Color: Green Width: 1.125 in Weight: 2.4 oz Length: 3.5 in Features of Convergent Hunting Solutions Overseer Closed Hand Call Easy to use. Air pressure is all that is required to vary tone and volume. Stainless Steel Double Reed Distressed Cotton Tail Sound Lanyard Groove Package Contents: Convergent Hunting Solutions Overseer Closed Hand Call Convergent Hunting Solutions OVSRCLRJR: Overseer Closed Reed Jackrabbit Hand Call Green