Spycatcher is now selling a 3G equipped spy camera and microphone air freshener. You discretely place the air freshener on your wall and it can record up to 1.7 hours of audio and video. The unit can stay on standby for up to 300 hours. With 3G capability, you can access the spy camera from anywhere in the world.
It’s just a bit pricey though at around $2500 with the current exchange rate. No word on whether or not it actually freshens your air- I would presume it does not.