LG to include the KnockON feature to the L Series II smartphones via global maintenance update in January 2014

LG has officially announced that its popular Knock feature, formerly known as KnockON, which was introduced in LG G2 as a convenient way to turn the smartphone on and off by tapping twice on the display is coming soon to all the L Series II smartphones. LG KnockON will also be included as a standard feature in the company's key mobile devices in the future.

LG L Series II

The feature will be rolled-out to the second generation LG L Series devices through a global maintenance release update starting in January 2014.

As of now, apart from LG G2, the KnockON feature has also made its way to the LG G Pad 8.3 and the LG G Flex, along with newly announced LG Gx.
"Knock is distinctively an LG UX and a great example of what happens when you marry the latest in mobile technology with consumer-centric insights. No one ever thought that a power button needed to be improved until our engineers wondered why they couldn’t turn the entire screen into a power button, " said Dr. Jongseok Park, President and CEO, LG Electronics' Mobile Communications Company.
Source - LG