I was hoping as a hobbyist to use this device to read my garage remotes, car remotes, handheld radios, etc. First and foremost, the single folded printer sheet instructions are very poorly written in an English translation. However, I finally figured out the following; To cycle through the modes, simply hold the button pressed in, and the modes will cycle on the display. Once your desired mode is reached, release the button, and you are now in that mode every time the unit is turned on or off. However, regardless of mode, this device will not simply stop, and display the frequency read. It will blink for a nanosecond, and that's it. You can try pressing the button really fast while you have max signal (the bar under the number that goes from left to right), in order to freeze the signal read on the display, but then the frequency still ends up being off, because what human has a response time in nanoseconds to try and get this device to freeze the frequency it read on the display, long enough for said human to read the display. When you transmit at a frequency, and this device reads it, the display should stop and hold the frequency read. Period. This particular device does NOT do that (regardless of mode). If it's supposed to, then the unit I received is defective. I returned it for a refund and will look elsewhere.