HAYDELS GAME CALLS INC Variable Tone Mallard Call Haydels Black Plastic Mallard Call Opening and closing the hole in the exhaust barrel allows the caller to sound like two different Mallards. Closed for older hen, open for higher pitch of younger hen. SPECIFICATIONS: Mfg Item Num: VTM90 Category: GAME CALLS Type :Duck Call Species :Mallard Material :Plastic Sound Species : Electronic : Battery : Color : Style : Water Environmental : Calls :