World's smallest GPS, suitable for Nikon DSLR. AK - G2 GPS receiver can take photos and record "geography markup" to your photo EXIF information, including longitude, latitude, altitude, direction and time information.Suitable for outdoor photographer, nature photographer, mountaineering, sports fans, journalists, inspector, the real estate agent, etc. Wireless: mini size. Built-in electronic compass, photo EXIF information recorded in the camera direction information (most of the other GPS don't have). Quickly and satellite collection. Auto sleep and energy saving mode (not automatically enter a dormant state, when you take a photo electricity savings). The GPS record last known position, indoors when using automatic recording on the photos. Use the ON/OFF switch. A shutter release interface. Data storage: longitude, latitude, altitude, direction and time information. Update rate: once per second. Satellite acquisition: the time needed for cold start about 30 seconds.Warm start about 3 seconds (open) the sky. GPS precision: 5 meters. Power supply: provide from the camera body.Work average power consumption: 60mA. The average sleep mode power consumption: 2mA. Working temperature is 0~40 degree celsius