Following its debut on the LG G2, "Knock" made its way to the LG G Pad 8.3 tablet, and the LG G Flex. The latter, featuring a curved screen, also has its power and volume buttons located on the back of the device.
Because those using the three LG devices with "Knock" were so enthralled with the feature, the South Korean based OEM decided to whip up a version for the LG L Series II models so that as many LG customers as possible can experience it.
+- Press Release
Knock was first introduced in LG G2 as a convenient way to turn the smartphone on and off by tapping twice on the display since the power button was located on the back of the phone. Then Knock was featured in a tablet for the first time with the LG G Pad 8.3 followed by the G Flex curved smartphone which also shared the rear button design of the G2. The reaction of audiences to this new feature was so positive that a version for LG’s best-selling L Series II was developed to offer the feature to as many customers as possible.
“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,” said Dr. Jong-seok Park, President and CEO of LG Electronics’ Mobile Communications Company, “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.”