The development of mobile learning applications is done to provide understanding to teachers by providing video examples of STEM learning in elementary schools. Focus Group Discussion (FGD) is used as a method of developing the product by holding discussions in the STEM learning device development team and ensuring the content of the application. The results of the development of the mobile learning application contain a video display of STEM learning implementation based on learning applications with components applied to mobile learning using enrichment modules, learning implementation planning, media, student worksheets, test questions, and performance discussion. STEM in elementary school.