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.
Buck Gardner Diver Duck Call Original price was: $19.99.$13.99Current price is: $13.99. 
koolsoo Duck Call Whistle Animal Calling Sounding Portable Lure Duck Call Device Animal Sound Imitation for Hiking Pheasant Waterfowl Original price was: $16.98.$14.99Current price is: $14.99. 
Haydels VTM90 Duck Variable Tone Mallard Call
Original price was: $43.25.$32.20Current price is: $32.20.
Additional information
| Brand | Haydel's Game Call |
|---|---|
| Merchant | Walmart – sporting goods |
