gofoyo k21 mobile game controller for pubg/call of duty/fortnite,aim trigger fire buttons l1r1 shooter sensitive joystick,gamepad for 4.7-6.5 inch iphone & android phone gofoyo the game controller can be contracted left and right, compatible with most mobile phones, work for 4.7-6.5inch phone, <br> enhance hand comfort, the round shooting game makes your hands no longer sore.<br> gaming experience improvement - help with gaming operation more flexible.<br> made of high quality material, ergonomic design, very durable<br> flexibility, precision, comfort, easy to control.<br> the 2 fire and aim button key can be flipped<br> how to setup:<br> 1.start your game, and clicks the settings-control-customize;<br> 2.move the "fire" button to the top of left corner;<br> 3.move the "aim" button to the top of right corner;<br> 4.adjust the shoot and aim buttons under the touchpad,of the cell phone game controller; <br> 5."save" your settings.<br>