Impact's Venture Wireless Controller with Nikon Shoe is the key to wireless triggering and TTL remote control of its Venture TTL-600 Battery-Powered Monolight. Operating on the 2.4 GHz bandwidth, the controller has 9 frequency channels, 3 groups per channel, and a range of up to 328' for TTL triggering with select Nikon cameras. The controller allows for high speed sync and second curtain sync. You can also control each monolight's light intensity from full to 1/128 power as well as setting the modeling light brightness from 10% to 100%. The controller runs on 2 AAA batteries and features a Mini-USB connector that allows for firmware updates directly from Impact's website.