Seriously reconsider. Eavesdropping is rude! But if you just have to do it, continue.
Turn on your Bluetooth headset. Make sure it is paired with your phone, and that the battery is reasonably fresh.
Hide the Bluetooth headset somewhere in the room where it will be able to pick up sounds clearly, but make sure that it is well hidden.
Leave the room, but don't go too far; your Bluetooth connection should work through walls, but if you get too far away, it won't work very well. The range is about 30 feet, or 10 metres.
Wait for the conversation of interest to start. When it does, turn on the voice recorder on your phone. It should record through the microphone of the Bluetooth headset.
At the end of the conversation, stop recording. If the phone stops recording automatically after a while, you may need to start it again. Retrieve the headset and play back at your leisure.
Optionally, use a microphone and Audacity, a free, open-source audio recording application, to dub the conversation to your PC. From there it can be emailed, or burned onto a CD.
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