Suitable for controller. New durable quality. Improves flexibility of operation and enhances gaming experience. Function Setting: 1. Long press the SET button for 2 seconds, the x light flashes quickly. 2. Press the M1 or M2 (press once to switch once), lights flash slowly in sequence (flashing sequence: x - o - - - R3 - L3 - - L2 - R1 - L1). 3. When the target button is flashing, press the SET button to 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 it still retains the last programming function. The factory default has no definition. Turbo Function: Press M1/2 and Turbo at the same time, the function key has turbo continuous launch function. Repeat this step to cancel. Color: Black Material: ABS Size: 99.5 x 57 mm Package Contents: 1 x Joystick Rear Button Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. Measurement allowed error is +/- 1-3 cm.