ATN Universal Thermal Target Pack & X-Sound Hearing Protector & Breek Arms Sledgehammer AR-15 Ambidextrous Charging Handle. Unlike other thermal targeting systems this one uses a uniform density heat-activated material which reacts with the laser's energy. This means it will give you a "readout" that is easily picked up by the Rifle Scope making it the perfect tool for any training scenario. One Universal target pack fits all ATN Thermal Rifle Scopes and the laser activation technology doesn't require any kind of outlet or connection to the Rifle Scope. After the shooter hits the "readout" the "hot" and "cold" sections of the target turn from white to orange indicating to the Rifle Scope that these are the proper settings. After enough practice the targets become "hot" and "cold" until the shooter hits either one or both of the targets requiring a completely different approach. This Universal target pack is easily assembled and it is backed by ATN's exclusive lifetime warranty. If you have any questions about the ATN Thermal targets or any other products from ATN please do not hesitate to contact our customer service for further assistance. Package Contents: ATN Universal Thermal Target Pack ATN ACMKIRTGCY-KIT1: ATN Universal Thermal Target Pack & X-Sound Hearing Protector & Breek Arms Sledgehammer AR-15 Ambidextrous Charging Handle