1. Suitable For Controller. 2. Brand new quality. 3. Improve the flexibility of operation and enhance your gaming experience. It is a back button for 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. 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 - - - R3 - L3 - R2 - L2 - R1 - L1) 3. When the target button is flashing, press the SET button, 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 Due to different batches, there may be differences in product appearance and printed text, which will not affect use. Colour:Black Material:ABS Package Contents: 2 * For Joysticks Rear Button Only the above package content, other products are not included. Note: Light reflection 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.