Does anyone know why when I do a Bluetooth search on an iPad or

Does anyone know why when I do a Bluetooth search on an iPad or my Note 4 my X5 watch shows up as X5-NC even though the Bluetooth on the watch is off. There must be something running it in the background when I turn on the screen but I can’t see what it is. I’m sure the watch doesn’t have NFC as this is what I first thought it was, but with the Bluetooth off it shouldn’t be broadcasting anything. This must also be draining the battery. Any ideas ??