Trip a flash with the advanced controls presented by a mobile app and an iOS device with this Flash Adapter from Triggertrap. It offers two hot shoe mounts and a cable for connecting to the Mobile Dongle needed for the Triggertrap system. The app then offers a programmable pulse length and sensor rest delay settings for complete control over the flash's firing. It also can use the variety of triggering methods available to the Triggertrap app and it has a 1/4"-20 thread for mounting.