It is a back button for PS4 controller. Paddles handle extended button, you can customize the mapping of the button function on the back, support the TURBO burst function, plug and play, and bring users a different gaming experience. 1.Suitable For PS4 Controller. 2. durable quality. 3.Improve the flexibility of operation and enhance your gaming experience. Function Setting: 1. Long press the SET button for 2 seconds, x light flashes quickly. 2. Press the M1 or M2 ( Pressonce to switch once ) ,lights flashing slowly 1n sequence ( FlashingSequence: x- o - △ - 口 - R3- L3- R2- L2- R1- L1 ) 3. When the target button is flashing, press the SET button,finish setting. Clear Cache: Long press the SET button for 5 seconds, the LED changes from blinking to off Memory Function: Insert the handle again and still retain the last programming function.The factory default has no definition. Turbo function: Press the M1/2 and Turbo at the same time, the function key has Turbo continuous launch function .Repeat this step to cancel Colour: black Material: ABS Size: 99.5 x 57MM Package Contents: 2 x For PS4 Joysticks Rear Button