Last year, Google added voice commands to toggle few settings options. At that time, it also supported few specific options. Now, Google has extended the support and added voice commands support for most of the settings option. Now you can toggle Wi-Fi, Flashlight and Bluetooth options just by Google Now voice commands Android Lollipop devices.
We tried this on GPS, Airplane Mode and few other options, but it is not working for these. It means, it has only extended support for few options. All these new voice commands are only working on Lollipop devices. Kitkat users are not lucky enough to get these voice commands.
Google has took long to add support for these simple voice commands. But still there are many which are missing. It is unclear why Google is very slow in rolling out these voice commands.
This voice commands option is very useful in Android devices. You can perform so many tasks on Android devices just by using few Google Now commands. You can take selfie, capture photos, Play Music, open apps and change various settings.
Source: Android Police