 I found this device here lying on the street as you can see the name says RAPU I assume that's how you pronounce the name now if you look here you will see an FCC number and a model number so looking this up on the internet I found that it is a wireless transmitter it's part of a headset wireless headset here an audio plug and it operates in the 2.4 gigahertz range so that's why I have my spectrum analyzer here so that I can check this so let's reset and switch it on like this okay and we can see some signals appearing so there's one signal at 2437 megahertz that's the right peak and the left peak is at 2427 megahertz