I use a 'ticket' lanyard with mine in it and hang it around my neck; pull it out of my jacket when I stop, scan the reader and ride on into my underground parking deck. It's about 3 inches wide by 8 inches tall but I got one to fit what i needed. You can find them in different sizes. Got mine off Ebay. I'll post a pic of mine if I can figure out how. It's great for not having to try and fumble around and dig something out with gloves on.