The Phottix PH89047 is an Odin TTL Flash Trigger for Sony (Tx/Rx Set). Photographers can wirelessly trigger TTL flashes, retaining full TTL functions, as well as remotely control power and flash zoom settings. Shooting with off-camera TTL flash has been made incredibly easy. The Odin is compatible with Sony TTL flashes and Sony digital cameras. The Phottix Odin TTL Flash Trigger for Sony is backward-compatible with Phottix Strato 4-in-1 and Phottix Strato II Multi 5-in-1 Wireless Triggers.