I was amazed that the Web express slot on my notebook was so small; somehow I thought that the "Express slot was larger than this; it's actually a little larger than a stick of double mint gum. Slides into the Express slot with a "click" and two little lights on the protruding edge wink as a connection is made with your wireless source. So far I think it's really very strong, and reliable...but I've only used it sporadically for 6 days. It was double the price at "new ovum", than compared to Amazon's vendor here. I wanted an "N" "Express slot" and they were the only place I found that had the trendNet...TrendNet's CSRs are very good, too.