If you have another Honda with keyless entry, you can program both cars to respond to the same remote. This way you do not have to carry more than one of the transmitters around with you. Warning: If both your Hondas are parked nearby, you may intend to unlock one, then get in and drive off, not realizing you have also unlocked the other one as well. While apparently some Honda vehicles can be programmed to respond to up to 5 transmitters, it seems the Insight can only remember 2. To do this refer to the Honda documentation that comes with the keyless entry accessory.