I use to have that ipaq too, but it worked fine for me. Once you got the swipe move correct, your done.. rfid might be the way to go. I would like a magnetic strip off some kind you can put in your wallet. So if you got your hands full just bump you booty towards the sensor at the wall of the door and it opens. Have seen those in company's and i would always keep it in my wallet and just swipe your body against something.