Lumen 2nd Press Button 3.5mm Slim & Smart Shortcut Customized Cool Gadget for Android Devices For Android OS devices like smartphone, tablet pc Perfectly compatible with MTK, Hisicon, Qualcomm and Samsung CPU products At least 3 shortcuts can be set and function successfully Totally 12 apps available for you to choose from(12 apps vary from differnt models; and the ''Open App'' is optional to all your apps) Max 8 apps can be added as the pictures(the number of Max apps varies from differnt models) That is, the KLICK app functions differently and variously for different Android models, please notice this.