necklace changed between red and blue dependent on the signals on Warwick's nervous system. Also in 2002, Xybernaut released a wearable computer called the Xybernaut Poma Wearable PC, Poma for short. Poma stood for Personal Media Appliance. The project failed for a few reasons though the top reasons are that the equipment was expensive and clunky. The user would wear a head-mounted optical piece, a CPU that could be clipped onto clothing, and a mini keyboard that was attached to the user's arm. GoPro released their first product, the GoPro HERO 35mm, which began a successful franchise of wearable cameras. The cameras can be worn atop the head or around the wrist and are shock and waterproof. GoPro cameras are used by many athletes and extreme sports enthusiasts, a trend that became very apparent during the early 2010s. In the late 2000s, various Chinese companies began producing mobile phones in the form of wristwatches, the descendants of which as of 2013 include the i5 and i6, which are GSM phones with 1.8-inch displays, and the ZGPAX s5 Android wristwatch phone. 2010s Standardization with IEEE, IETF, and several industry groups (e.g. Bluetooth) lead to more various interfacing under the WPAN (wireless personal area network). It also led the WBAN (Wireless body area network) to offer new classification of designs for interfacing and networking. The 6th-generation iPod Nano, released in September 2010, has a wristband attachment available to convert it into a wearable wristwatch computer. The development of wearable computing spread to encompass rehabilitation engineering, ambulatory intervention treatment, life guard systems, and defense wearable systems. Sony produced a wristwatch called Sony SmartWatch that must be paired with an Android phone. Once paired, it becomes an additional remote display and notification tool. Fitbit released several wearable fitness trackers and the Fitbit Surge, a full smartwatch that is compatible with Android and iOS. On 11 April 2012, Pebble launched a Kickstarter campaign to raise $100,000 for their initial smartwatch model. The campaign ended on 18 May with $10,266,844, over 100 times the fundraising target. Pebble released several smartwatches, including the Pebble Time and the Pebble Round. Google Glass launched their optical head-mounted display (OHMD) to a test group of users in 2013, before it became available to the public on 15 May 2014. Google's mission was to produce a mass-market ubiquitous computer that displays information in a smartphone-like hands-free format that can interact with