Hand tracking During Oculus Connect 6, it was announced that hand tracking would be added to the Quest in early-2020, utilizing machine learning, Oculus Insight, and "model-based tracking" to recognize the position and gesture of the user's hands without additional hardware. Hand tracking was initially introduced as an experimental feature in December 2019, as part of Quest system software version 12. It was limited to the main user interface and selected built-in apps, such as the web browser. It was also announced that the Oculus Quest SDK would be updated to add support for the feature. In May 2020, hand tracking exited beta, and became available for use in third-party software beginning May 28. Controllers The Oculus Quest uses second generation Oculus Touch controllers. Their designs were modified to accommodate Oculus Insight, with their tracking rings moved from the back of the controllers to their tops so that they can be tracked by the headset's cameras. Audio The Quest has embedded speakers, as well as a pair of 3.5 mm audio jacks on each side for use with external headphones. Accessories Though the Oculus Quest has built-in audio, it is possible to purchase official in-ear headphones from Facebook. There is also an official travel case. Following the release of the Oculus Link feature, Facebook released an official -long USB-C cable designed for use with the feature. The cable is fiber optic, as the reliability of non-powered USB cables with copper-based wires diminishes at . Software Facebook enforces stricter content and quality standards for software distributed on Oculus Quest in comparison to Oculus Go and Gear VR, including requiring developers to undergo a pre-screening of their concepts to demonstrate "quality and probable market success". In 2021, Facebook introduced "App Lab", a new section within the storefront allowing developers to upload and distribute Quest apps without going through the formal review process. App Lab is designed primarily to support early access models, and can support public and invite-based distribution. Facebook launched the headset with over 50 titles consisting of a mix of new and ported games, including titles such as Beat Saber, Moss, Robo Recall, Superhot VR, and VRChat. Some games support cross-play with their PC versions. At Oculus Connect 6 in September 2019, it was announced that backward compatibility with over 50 Oculus Go applications and games would be added to the Quest. In addition, users who had purchased Oculus Go