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Here is a thermometer with a hidden camera that you can use to track what happens at your place. It records 640 X 480 @ 30fps and 1280 X 720 @ 30fps videos. The device offers standby time of up to 5 days. It can take still photos in addition to videos. A 4 GB Micro SD card is included. This is a pretty compact device you can carry with you anywhere. Not a cheap device though.
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