The Phottix Strato TTL Flash Trigger for Canon - the newest addition to ever-popular Strato series of flash triggers and wireless remotes. It provides an easy-to-use and affordable TTL flash triggering solution for photographers. With the LCD display and quick-change buttons adjustments are fast and easy. High-speed and second curtain sync are supported in this 4-channel, 2. 4 GHz transmitter and receiver set. Shoot at maximum shutter speeds of 1/8000 s. * Triggering hot shoe flashes is only the start of the Phottix Strato TTL's abilities. The Strato TTL will also trigger Moonlights as well as function as a wired and wireless shutter release. In-camera flash menu functions are also supported by the Strato TTL. Changes made to flash mode, AF assist light, exposure lock, exposure compensation and flash focal zoom, metering modes and changing channels can be done from the camera menu if desired. * The Strato TTL flash trigger is part of the ever-growing Phottix ecosystem and is compatible* with the Phottix Strato I and Strato II Multi series of triggers as well as the Phottix Atlas II. The Strato TTL features a USB port for firmware upgrades. You won't get left behind as camera and flash technology changes. The Strato TTL also features an optimization mode for Canon 1Dx cameras. The receiver is easy to connect to light stands or other grip with a locking metal cold shoe and 1/4 x20 threaded lug. The Strato TTL transmitters and receivers use AA batteries, just like hot shoe flashes - carrying different sized batteries is no longer a concern.