SMDV 16 Channel, Flash Wave III Radio Trigger 2.4 GHz Transmitter, -- Flash Wave III transmitter TX, for Canon, Nikon, Pentax, Olympus, Nissin, Flash, and Studio Strobe Premium Grade, Made in Korea, Heavy Duty Built with Metal Reinforcement, and Metal Hot-shoe 2.4 GHz with 16 Channels, and 700ft range Max Sync Speed 1/250s, Powered by 1x CR2450 Lithium Battery (Included). Highly Reliable, and Most Consistent Result for Pros. 24 Month Warranty