High-powered, for big studios or large-scale industrial/architectural work. Maximum range - 600 feet! Two "AA" batteries (not included) in the transmitter power up to 5,000 shots. With fresh batteries, transmitter recycle times average less than 1 second, so you'll never miss a shot. Set contains one SSR Open Channel transmitter and SSL-E "H" monoplug receiver, 10" miniplug to PC coiled cord, stainless steel mount clip and extra Velcro strip.