Promote Systems GPS Receiver GPS-N-1 for Nikon D300, D700, D3, D2X, D2Xs, D2Hs, D200 and Fuji S5 Pro, IS Pro, DSLR Digital SLR Cameras Immediate geotagging - no computer processing required Dependable 20 channel GPS receiver powered by SiRFstar III chipset to ensure stable satellite lock-ons No batteries required - powered directly from camera Low power consumption for longer shooting sessions Automatically powers on and off along with camera exposure meter