PIXEL KING 2.4GHz Flash Radio Wireless Remote Shutter and Flash Trigger for Canon EOS camera and flashes-E-TTL II / E-TTL Simple, Small, Reliable wireless trigger with 7 selectable channels 2.4GHz channel and FSK modulation system Max operating range of approx 328 feet (100 meters). Ultra-low standby power consumption Flash sync speed of up to 1/250s