64 GB of internal storage. The integrated Adreno 530 GPU provides roughly 500 GFLOPS of graphics performance. The device is equipped with a 2600 mAh battery, which provides up to two hours of gaming or 2.5 hours of video playback according to Oculus. The Go has non-positional 3-degrees-of-freedom tracking, a proximity sensor for detecting when the headset is being worn, and a small controller that functions like a laser pointer in the virtual environment. The headset is outfitted with a fast-switching 5.5-inch LCD display with a 2560 x 1440 (1280 × 1440 pixels per eye) resolution in an RGB-stripe subpixel arrangement. The headset has a field of view of about 101 degrees, which gives it a horizontal pixel density of pixels per degree. The headset uses Fresnel lenses that are improved over those used in the Oculus Rift and according to Oculus, were the best lenses the company had produced at the time of the Go's release. The headset doesn't feature physical interpupillary distance (IPD) adjustment and has a fixed lens distance of 63.5 mm, which according to Oculus best accommodates users with an IPD between 61.5 and 65.5 mm. The Oculus Go controller is a wireless, orientation-tracked remote controller with pointer capabilities that is used to interact with applications and games. In addition to a touchpad, the controller has three buttons that can be used to select things, go back to a previous screen or menu, and return to the Go's home screen. The controller is powered by a single AA battery and allows for either hand to be chosen to function through the Oculus Go. The Go is available in two storage configurations: a model with 32 GB of internal storage for US$149 or 64 GB of internal storage for US$199. While the Go doesn't support external storage, support for USB flash drives via the device's microUSB port was initially planned to be released as an update. However, in November 2019, John Carmack stated the feature wouldn't be released due to a hardware issue Oculus was unable to fix. Oculus offers accessories and replacement parts through their website, including a carrying case and a fitted facial interface for people with low nose bridges and high or wide cheekbones. A replacement controller and facial interface are also available. In addition, Oculus promotes the online eyewear retailer FramesDirect.com as a source of prescription lenses for the Go. Oculus also offers