Developments such as wearable technology have become an essential trend in fashion. Most energy scavenging devices for wearable electronics generate very little power. Some fashion designers have adapted polypropylene to construct jewelry and other wearable items. Now commonplace, this technology is extended to digital cameras and other wearable devices. The company designs and manufactures headphones and wearable activity trackers. The most notable change was the drop of toy's clothes and wearable accessories. Another increasingly popular wearable technology involves virtual reality. They are also used in cars, wearable devices and other devices. Intel developed a reference design for wearable smart earbuds that provide biometric and fitness information. Solid-state batteries have found use in pacemakers, RFID and wearable devices. Technology has advanced with continuous change in wearable computers. Other journalists and commentators also called the trial beneficial and an innovative application wearable technologies. Wearable technologies are increasingly used in healthcare. Many technologies for wearable computers derive their ideas from science fiction. Timex Datalink is another example of a practical wearable computer.