E.g. "nikon d40x battery grip"
By Nikon Machine:

Nikon D40x Battery Grip - It is equipped with an infrared vertical-grip shutter release button to enable shooting in the same fashion as a horizontal grip. But before you use the shutter release button on grip, you should set the camera release mode to 'Quick-response Remote' or 'Delayed Remote'. Nikon D40x battery grip can hold two Lithium-ion battery packs EN-EL9 or EN-EL9a. The D-SLR Camera Battery Grip for Nikon D3000 / Nikon D40 / Nikon D40x / Nikon D60
Features:
--self-developed info chip allows complete campatibility with original cameras
--full function design ,including vertical shutter ,command dial and other function buttons
--Ergonomics design ,operating comfortably
--engineering plastic body and passed the drop test
--PU anti-scratch surface dealing
--100% compatible with OEM battery.
Nikon EN-EL9,Nikon EN-EL9a
Nikon D3000,Nikon D40,Nikon D40x,Nikon D60
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