This AK-4NIII designed for high end Nikon digital SLRs. When connect a supported camera with adapter, the camera will have Bluetooth function to acquire GPS data from Bluetooth GPS receivers/loggers. The GPS data (Latitude, longitude, altitude, UTC time) will record in the EXIF file of photos when shooting. GPS receiver can be put in pocket or bag. No more cords or clutter! Compatible with Holux M-241 Holux M-241C Holux M-1000 Holux M-1000B Holux M-1000C Holux M-1200 Holux GPSlim240 Holux GPSlim236 Holux GPSlim236B Qstarz BT-Q1000X Qstarz BT-Q818X Qstarz BT-Q816X Royaltek MBT-1100 Royaltek RBT2200 Royaltek RBT2300 GlobalSat BT 328 GlobalSat BT 368 DAGAMA SG-26 i-Blue MobileMate 886 i-Blue 737A i-Blue 747A Palm GPS receiver NCSNavi R120