Solmeta GMAX-GF Photo/Video GPS BDS Dual-positioning Geotagger & Bluetooth Shutter Release for Nikon camera D750, D610, D7200, Df & Coolpix A...with 4GB Flash,1900mAh Li-ion, Altimeter,eCompass,LCD... Embeds location, time, shooting direction into every video or image EXIF for Nikon Df, D750, D610, D600, D7500, D7200, D7100, D7000, D5600, D5500, D5300, D5100, D5000, D3300, D3200, D3100 and CoolPix A, P7800, P7700 Dual-positioning systems: GPS and BeiDou (BDS) provide 20% more location accuracy than GPS alone, faster signal acquisition Can act as a stand-alone "Trace Logger" while sailing, hiking, flying, skiing, traveling, etc. 4GB Course Logger plus altitude & speed data, runs 18hrs without camera battery drain Measures Barometric or GPS/BDS altitude, user can choose their preferred altitude data base on actual environment Bluetooth technology enables the iPhone itself used as a remote triggering device for the user's DSLR camera. 2 years Mfg. Warranty!