Suitable for PS4 Controller. Durable quality. Improves operational flexibility and enhances your gaming experience. Function Setting: 1. Long press the SET button for 2 seconds; the X light flashes quickly. 2. Press M1 or M2 (press once to switch once); lights flash slowly in sequence (X – O – Triangle – Square – R3 – L3 – R2 – L2 – R1 – L1). 3. When the target button is flashing, press the SET button to complete the setting. Clear Cache: Long press the SET button for 5 seconds; the LED changes from blinking to off. Memory Function: When reinserted, the controller retains the last programmed function. Factory default has no preset definitions. Turbo Function: Press M1/M2 and Turbo simultaneously to enable continuous turbo activation for the assigned function key. Repeat the same step to cancel. Color: Black Material: ABS Size: 99.5 x 57 mm Package Contents: 1 x Rear Button Add-on for PS4 Joystick Note: Color may vary slightly due to lighting conditions and screen settings. Measurement tolerance: ±1–3 cm.