Radio Remote Flash Trigger for Nikon .It uses a wireless frequency which is suitable for free channels in many countries. With 16 independent channels, many photographers can work together using trigmaster, operating efficiently at high speeds and long distance in a stable manner. When using a Nikon camera to control the speedlight, the flash sync speed works up to 1300s, and 120 meters remote distance (in open areas). It can work as studio flash trigger, as speedlight trigger.