Field Proven Calls Poly Double Shot Duck Calls -Its versatility of multiple pitched hens is an innovation that double reed callers are going to love. The chatter is sharp, crisp and has the control of a single reed. The most impressive aspect is its volume control. Whisper the softest quacks and cadences for timber hunting and no wind days and then as quick as a deep inhale you can lay into it to get volume and power. Hand tuned and tested. The ultimate full range duck calling machineAllows deep low end quacks and soft hen cadencesMultiple pitched hens