For starters, it's a convenient promotional gift (you won't even notice you're wearing it) and practical for conferences and events if your clients also go to places where they need to be identified, and even for workplaces where it's compulsory to carry identification, such as office workers or nurses in hospitals. Another advantage is that it is a cheap and inexpensive product, which makes it an ideal gift so that your customers don't get lost and lose their belongings.