The burst function can be set to any back clip button, and supports three-speed burst speed adjustment. Short press the 'Burst' button, the blue light bar is always on, which means that the button burst function can be set. Shortly press one of the back clip buttons, the burst speed of the back clip button will be switched according to the cycle of 'slow-fast-ultra-fast-off',The blue of the light bar is indicated by the corresponding cycle switching of 'slow flashing-fast flashing-ultra-fast flashing-steady on'. After the setting is completed, short press the 'Burst' button again, the blue light bar will turn off, and exit the button burst function setting. At this time, you can use the back clip button to play normally. Mapping Function The mapping function can set the L1/L2/R1/////X/ keys in the handle, a total of 12 function keys. Short press the 'mapping' button, the light bar is always on in orange, which means that the button mapping function can be set. Press and hold one of the back clip buttons and any function key of the handle for 1S at the same time, the light bar flashes orange for 3 times and turns steady on, indicating that the back clip key mapping setting is successful. After the setting is completed, short press the 'mapping' button again, the orange light bar will turn off, and exit the mapping function setting. At this time, you can use the back clip button to play normally. Compatibility (BDM-010/BDM-020). Colour:A: black Material:plastic Package Contents: 1 x Buttons on the back of the clip 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.