Embrace reliable wireless triggering of your flashes with this Ares II Flash Trigger Transmitter from Phottix. This system offers an incredible range of 492' along with a 2.4 GHz frequency to help limit interference. Users will also have access to 16 channels, the first four of which will support Strato II receivers as well, and four groups. Users can also set a digital ID code in order to ensure there is no interference from other users in the area. All of these settings can easily be set and checked via the backlit LCD screen for convenience. The Ares II system has a maximum sync speed of 1/250 second and attaches easily to most camera's hot shoe. Additionally, it runs on two AA batteries.