Yes they do. The V1 will even give a notification (J-junk) for a cheap detector it picks up a signal from. You need to check the minutia with Valentine or Bell. The Valentine is supposed to be virtually invisible. I think it's Bell that has one which they state cannot be detected.

The cool thing about the hidden mod is that he figured out how to mount it in the head liner so it cannot be seen. The Valentine has a port which allows it to interface directly into the BMW iBus. This is achieved through the Stealth One interface module, allowing the dash display to show the indicators. You can then turn off the detector's lights. Control of the V1 then occours with the steering wheel switches. Hide the wires and it is absolutely unseen. A few people have put it into the rear headrest or front head rest as well.

I am not endorsing, just trying to give a little info so you can make a more complete decision. I have both v1 and s1 units. You can search threads for them.