surfaced on March 17, 2010. Ads later surfaced on June 13, 2010 showing a slimmer Xbox 360 design, which was expected to include a 250 GB hard drive and integrated Wi-Fi functionality. The console's casing is revised in comparison to the previous models, with a glossy black finish and capacitive power and eject buttons. Sounds are played when the power is turned on or off and when the disc tray is opened or closed. The internal hardware was redesigned using a new motherboard codenamed "Valhalla", which integrates the CPU, GPU, and eDRAM into a single package using a 45 nm fabrication process. As the CPU and GPU are integrated into the same die, they may also share the same heatsink and fan, which reduces the console's noise output, and its power consumption by roughly half in comparison to the original Xenon motherboard. The S has two additional rear USB ports, as well as a proprietary port used to connect the Kinect sensor. The motherboard has an integrated 2.4 GHz 802.11 b/g/n Wi-Fi adapter, and a TOSLINK S/PDIF optical audio connector. The S no longer includes Memory Unit slots; USB drives can alternatively be used to expand storage. The external hard disk drive connector has also been swapped for an internal bay for use with a proprietary hard drive. The hard drive bay is designed such that a specially formatted 2.5" hard drive may be loaded in. Data can be transferred from a previous console using a USB transfer cable sold separately. If removed from its casing, a hard drive from a previous generation Xbox 360 can be implanted into the drive bay instead of purchasing a hard drive branded for use with the new model. Unlike previous generations of the console which had names to distinguish different SKUs, the new models' retail units were branded by their internal storage capacity in a similar fashion to the various models of its main competitor the PlayStation 3. When the first new models began to ship, remaining stock of the Elite package dropped in price to US$249.99 or A$349 and the Arcade dropped to US$149.99. The first Xbox 360 S SKU revealed included a 250 GB hard drive and its casing featured a glossy black finish. It was shipped to US retailers the same day it was announced (June 14, 2010) and went on sale later that week. It was released in Australia