This mobile gaming controller definitely improve your gaming experience. Good Compatibility - This set of mobile game controller are designed for 4.5-6.5 inches and Android phones. Mobile gaming joystick controller is triggered physically,it has no any effect on the screen.It is easy to setting and use. Versatility - This Mobile game controller suite for games especially for , Knives Out, Rules of Survival, , Critical Ops. Portable Design - This mobile game trigger controller with a plastic box. and tiny to carry with and play games anywhere and anytime. Top Features for Mobile Game Controller Using Instructions: Before playing game, customize your Fire and Aim buttons under the Touch-pad of the knives out game controller. With the Mobile Controller, you can simultaneously move, turn, aim and by using the index fingers to press the buttons, which can the trouble that use thumbs only to make all operations. When the installation is completed, you need to lock your screen, Start game again and then these buttons work normally. According to different mobile phones models, It may have position deviation shown in the picture, please adjust your button in a comfortable way. HOW TO USE THE MOBILE GAME TRIGGERS? 1. Start your game, and clicks the Settings-Control-Customize; 2. Move the "FIRE" button to the top of left corner; 3. Move the "AIM" button to the top of right corner; 4. Adjust the and aim buttons under the touchpad,of the cell phone game controller; 5. "Save" your settings. Color: black + red material: plastic size: 5*3*2cm Package Contents: 1 pair * mobile game controller(L1,R1), with plastic box Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.