US Military Equipment Strobe Light SDU-5/E strobe light used by the US military. This light is part of the personal survival kit used by US military pilots. It is used by pilots and others to indicate their rescue location to rescue teams. Pilots attach this device to a string and deploy it with their parachute when ejecting from an aircraft (if there are no enemy forces at the planned landing site). For this purpose, the string is connected to the case, which helps prevent loss. The original battery is not included. An adapter was created because the original battery discharged, and it operates with two domestically available CR2 batteries. The flashing frequency is approximately 45 times per minute. It was tested every six months as a disaster prevention item. The homemade adapter was created by referring to a video on the website of a company that sells modified adapters. There are no circuit modifications, only modifications to create the battery connection springs. Please check the video. If you can obtain the dedicated battery, you can use it simply by removing the adapter. If you prepare spare batteries, it will be a reliable companion in the event of a disaster. The reliability is different from civilian strobe lights. Two CR2 batteries are included for operational testing. * Unlike ordinary flashlights, which have the positive terminal first, this strobe light has the negative terminal first. Please be careful when using it. - Color: Red - Accessories: Pouch - Fastener: Shoelace type - Material: Nylon