With the rubber bands in place and if you take the call and smack the palm of your hand quick you can cluck nicely. Works on eother double or single sided boxes.

Others have mentioned if you grab the box by the end with the paddle facing outward (double sided box calls only) you can make a preatty good gobble sound by shaking the call.
I love my boxes - burned a few up tho with the cutting I do!

JW