The Jammer is a simple, yet effective tool that is designed to prevent a door from closing. A 25-year retired police sergeant and emergency services team member designed it. The Jammer sets quickly and easily and will not fall out. The Jammer fits easily in your pocket, on your service belt, or tactical vest. Unlike conventional door wedges, the design of the Jammer prevents it from coming loose as people come and go. To use, simply place the Jammer on any door hinge and that’s it. Originally released in 2011, the Jammer has more than 25,000 pieces in service throughout the emergency services industry.