LG Electronics' Knock feature (formerly known as KnockON) will be included as a standard feature in the company's key mobile devices in the future while its line of L SeriesII smartphones will receive Knock through an upgrade starting in January 2014. 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.