Android 6.0.1’s headline feature is a new set of emoji, but did you know it also adds a handy new camera launch mode to older Nexus devices? The Nexus 5X and 6P have had the double-tap power camera launch shortcut since they went on sale (and dropped a twist-to-launch gesture), but now the feature has trickled down to older Nexus models. Specifically, the Nexus 5, 6, 7 (2013) and 9 now all support it as of Android 6.0.1.
Tip: Android 6.0.1 Brings Double Tap Power To Launch Camera To Nexus 5, 6, 7 (2013) And 9 was written by the awesome team at Android Police.
Source: Andriod Police