The NKS7-100-20 is a SAR (Search and Rescue) system that is used to locate people in distress, particularly those in remote locations. It is a self-contained, portable, lightweight radio transceiver that can be used in a variety of environments and conditions. The SAR unit transmits on a standard frequency and has a detection range of up to 100 km. The unit has an automatic recognition system so it can be programmed for any specific type of signal. It is powered by a rechargeable battery and has a maximum battery life of 20 hours. It has a built-in GPS receiver and can output location coordinates to a handheld device or computer. Additionally, the SAR unit has the capability of transmitting voice and data messages to other SAR units or base stations.