As we are 007, so we are up to a secret video and audio recording, you have a full set of possibilities. Every modern cell phone has a voice recorder inside, many of them have cameras. However, it would be clearly obvious that you are recording if you are holding phone in your hands.
Ajoka Obaba buckle Camera is designed for James Bond and some one like you for some secret recording.This buckle has a secret hidden inside of it - tiny video and audio recorder. Wireless cameras are a no-go in places where they can be detected by wireless camera detectors, so when you are forced to use another way of recording - put it on your belt and it will film everything you want, with practically less risk of getting caught. Miniature camera records video in 3GP video format (176x144, QCIF) with sound, which can be saved on the microSD card from 128 MB up to 2 GB. Recordings can be played on PC or on your mobile phone.
It can live 3 hours on one battery charge, but if you want to record a 3 hour length video you'll need some spare cards - 1 GB microSD card can only take up to 33 minutes of video.
It is available in two models: classic one, called Buckle DVR, and strangely shaped one called Obaba DVR. The only problem seems the lighting, if it work in dark would be OK, but do not dream that you can take any obsence picture with your partner unless she is stupid to allow you using belt in bed!!