Nexus 5X (codenamed Bullhead) is an Android smartphone manufactured by LG Electronics, co-developed with and marketed by Google Inc. as part of its Nexus line of flagship devices. Unveiled on September 29, 2015, it is a successor to the Nexus 5. Nexus 5X along with Nexus 6P serve as launch devices for Android 6.0 Marshmallow, which introduces a refreshed interface, performance improvements, increased Google Now integration, and other new features.