Item type: Gaming Trigger Applicable: 4.5-6.5 inches screen devices Color: Black Features: Portable, easy to use Material: Metal+plastic Package includes: 1 pair of Gaming Triggers(Left and Right) How to set it? 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 shoot and aim buttons under the touchpad?of the cell phone game controller; 5."Save" your settings. Note: The colors deviation might differ due to different monitor settings. We provide you with the best product and service, if you have any problem, please let us know, and we will solve the problem ASAP. Thank you so much.