colour: black Material: ABS Package Contents: 1 x MB-D18 battery grip 1 x EN-EL15a type battery holder 1 x AA battery holder 1 x Contact cap 1 x Chinese and English instructions Only the above package content, other products are not included. Note: Light 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. [Compatibility]Compatible with D850 Cameras [Extender work time]Support AA or EN-EL15 Battery,if hold AA or EN-EL15 batteries only for 7FPS , Or use EN-EL18 battery and BL-5 battery chamber for 9FPS . [Enhance Stability]Great rubber-coat give better hand feeling and extra weight help balance the camera and telephoto lens and anti-shake. [1/4 standard screw hole] It could be mount on tripod easily and quickly. [Vertical ] own shutter release on same position as camera,give same feeling as horizontal , suitable for portrait