Even the flue heat detectors have a pinhole Orz ...

Always felt should be 「introduction pinhole 」 camera open column, it's not what advanced technology, which is normally more to find out what possible holes. Impression in the domestic sales of these devices seem guilty (listen to others that are not able to sell the aircraft camouflage too exaggerated, and if the General size of chewing gum wrapper is OK), but in any case, do not harm the heart