Feature: For Multi-Function Back Button: Designed for Controllers. Two programmable buttons: Two programmable high-tactile back buttons, allowing you to display more movement and flexible movement in competitive games Up to 14 mappable keys: up to 14 programmable keys (X key, Y key, A key, B key, RB key, RT key, LB key, key, R key, L key, key), free mapping to help you win in materials, comfortable grip: The programming key puller is designed with metal alloy material, the keys feel good, and the grip is comfortable 3.5mm headphone jack: This product is equipped with a 3.5mm headphone jack, you can enjoy the sound effects in after plugging in the headphones, other external noise, and immerse yourself in (Note: The 3.5mm headphone jack on the back button is cannot be used at the same time with the for ) Plug and play, easy installation: easy and convenient installation, plug and play, there will be no scratches or scratches on the controller during installation. Note: for the Android interface model installed on the for Back button, it does not support PC side,. Design that fits the back of for : The design of the full-fit controller prevents the multi-function back keys of the for from loosening or falling Product name: for multi-function back button Input voltage: 5v Set: A for Material: plastic colour: black Package Contents: 1 x Back clip button(for ) 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.