Its main purpose is making definite electric current through the poultry in a short time, then stun the poultry. So you can guarantee that the poultry don't flounder after killing, avoid the wing and foot broken. Besides,killing is humanitarianism. The stunner applies to chicken, duck and goose. The voltage is adjustable between 10 to 110 V and the height of stunner can be adjusted according to the length of poultry.