ELtem Co. Ltd is a high-tech enterprise engaged in research and production of Surveillance Systems and Disaster Mass-Notification & Life Safety P.A. Systems based on the longest range, most intelligible and reliable acoustic hailing devices for long range and a directional speaker system.ELtem Corporation is using long-range communication to safely hail and warn, inform and direct, prevent misunderstandings, determine intent, establish large safety zones, resolve uncertain situations, and save lives on both sides of the long range acoustic device.We have our R&D team which has outstanding engineers and advanced manufacturing, and have various products which can be applied specific situations. PROPA is the product lines of acoustic device systems for long distance which are manufactured at ELtem Co., Ltd in Korea.PROPA broadcasts clear sound to a long distance, for they are the most intelligible and reliable high-powered directional speakers which is available for broadcasting and warning by using recorded sound sources and a highly sensitive microphone.Overcoming the limitations of the existing P.A. System, PROPA maintains the maximum output of 142dB so that you can communicate clearly over loud background noise to the insides of vehicles, vessels, or buildings to determine intent, modify behavior safely, and enhance response capabilities.ELtem Corporation has manufactured a variety of state-of-the-art devices such as high powered acoustic devices, super directional loud speakers, and a laser illuminator.Eltem's goal is to make a society safer and its technologies allow effective and efficient counter actions against both man-made disaster and natural disaster. Eltem will continue to upgrade existing product lines and develop the world's best technologies in safety and security market. Thank you.