Trigger Mobile Game Controller: Easy to install and detach and simple operation. Phone Game Assistant Joystick: Mini size, lightweight and portable, suitable for outdoor use. Game Joystick For Phone Tablet: 2Pcs Mobile Phone Game Joystick Game Controller Metal Tablet Touch Screen Joypad Game Controller Game Trigger Press Assistant Button for Gift (Silver). Cellphone Game Trigger: sensitivity. Electrostatic induction through the principle that touching the metal ball will trigger the skill below