Immediate effect the contact points on the underside saturates the sensory nerves distracting the patient from the pain signals caused by the needle poke?? no waiting for topical anesthetics to take effect</br>Easy to use just press shot blocker firmly over the injection site and give the injection through or near the opening</br>Versatility  useful in intramuscular injections??  subcutaneous injections and other procedures that include a painful needle poke</br>Cost benefit less costly than anesthetic creams or freezing sprays faster??