FlashWave2 Wireless Radio Slave (Remote Wireless Flash Trigger System) - Transmitter and Receiver Set Simple, Small, Reliable Hot shoe built into the receiver! No need for extra cables or adapters. Up to 250 feet (75 meters) operating range. 10 Channels. Max sync speed of 1/200s Built-in 1/4" tripod thread on the receiver unit for mounting on a tripod or light stand