Phottix Odin TTL Wireless Flash Trigger for Nikon - Transmitter Only (PH89058) Wireless 2.4GHz TTL and manual flash triggering,Range of 328ft Access to 4 Channels and 3 Groups Maximum Sync Speed of 1/8000 Second with High Speed Sync Compatible with Phottix Strato II and Atlas II Wireless Radio Flash Triggers Compatible with Nikon TTL system