I got the same question before
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Before i got my Venza on 06/15/10, I got the same stupid about the smart key. It is convenient one way and seems to be a little more to handle another way. You don't have to take the key out to get into the car and start it but I have to worry about battery draining and the care of it.
One warming in the manual said placing the smart remote next to the computer, wireless devices, and electronic devices (like TV?) may adversely affect or reduce the battery life... Well, I sit next to the wireless computer and TV all day long!
The car however is a joy to drive!
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2010 Golden Umber Mica Venza AWD V6/Nav/Towing Prep/HID/...the works except moonroof.