Hi. I bought 3 mk15s and installed a sprayer and camera on the bird. Unfortunately, all 3 have many problems. First, it gets very hot and the screen fades due to the high temperature, and it also gets very slow. The connection is disconnected and reconnected at a very close distance. The other bird, which is not imaging, has the same problems and the image does not exceed 2 km. Another radio has no screen at all and the LCD has a problem and sometimes has an image. In general, this product has many problems and its advertisements are not correct at all, and I do not know how you put the high-suffering test video on the Internet, where buyers in various forums all complain about its low suffering. I want to raise these issues in other forums so that others like me do not make mistakes in buying. Please let the manufacturer know my complaint. Thanks