Estone&reg; 1PC Klick Quick Button Dustproof Plug For Andriod Smartphone 3.5mm Jack For Android OS devices like smartphone, tablet pc(not compatible with Android 2.3 OS at the moment) No complex ''unlock~ home~ apps~ open an app'' any more; Just Press and directly open an app in a convenient and fast way on the locked screen Press button, a smart and cool gadget designed for customizing shortcuts Just plug into the 3.5mm earphone jack, set your own shortcuts in a second