Medical ID Key Chain Whistle. This is a new medical ID key chain whistle. This can be used for medical emergencies. The end unscrews to hold your emergency medical information. It has the words "In case of emergency open capsule". It measures approximately 3" (76 mm) long and 7/16" (11 mm) in diameter. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.