A resettable injection training device, comprising: a body comprising a proximal end and a distal end, the body defining a cavity there within, the body having a body locking surface adjacent to the proximal end; an injection simulation member extending from the distal end of the body; a releasable locking shield comprising a proximal end and a distal end, the shield being slidably engaged with the body and slidable between a retracted position to expose the injection simulation member and an extended position to cover the injection simulation member, the shield comprising at least one arm having an arm locking surface configured to interface with the body locking surface to releasably lock the shield in the retracted position; a biasing member disposed between the distal end of the shield and the distal end of the body, biasing the shield toward an extended position; a plunger comprising a proximal end and a distal end, the proximal end comprising an end member having a contact region, the plunger being slidable within the cavity, such that a pressure applied to the end member advances the plunger toward the distal end of the body, wherein an interface between the contact region and the at least one arm releases the arm locking surface from the body locking surface to release and extend the shield; wherein the device further comprises one or more indentations adjacent to the distal end of the body, and the shield comprises one or more interfacing tabs adapted to interface with the one or more indentations in the body to maintain the shield in the extended position, such that the one or more tabs are slidable relative to the one or more indentations upon an application of a force of between 100 Newtons and 0.01 Newtons on the distal end of the shield to retract the shield; and wherein the retraction of the shield resets the device for being used in a subsequent injection training. a body comprising a proximal end and a distal end, the body defining a cavity there within, the body having a body locking surface adjacent to the proximal end; an injection simulation member extending from the distal end of the body; a releasable locking shield comprising a proximal end and a distal end, the shield being slidably engaged with the body and slidable between a retracted position to expose the injection simulation member and an extended position to cover the injection simulation member, the shield comprising at least one arm having an arm locking surface configured to interface with the body locking surface to releasably lock the shield in the retracted position; a biasing member disposed between the distal end of the shield and the distal end of the body, biasing the shield toward an extended position; a plunger comprising a proximal end and a distal end, the proximal end comprising an end member having a contact region, the plunger being slidable within the cavity, such that a pressure applied to the end member advances the plunger toward the distal end of the body, wherein an interface between the contact region and the at least one arm releases the arm locking surface from the body locking surface to release and extend the shield; wherein the device further comprises one or more indentations adjacent to the distal end of the body, and the shield comprises one or more interfacing tabs adapted to interface with the one or more indentations in the body to maintain the shield in the extended position, such that the one or more tabs are slidable relative to the one or more indentations upon an application of a force of between 100 Newtons and 0.01 Newtons on the distal end of the shield to retract the shield; and wherein the retraction of the shield resets the device for being used in a subsequent injection training.