The Phottix Atlas II (Twin Pack) is the professional choice for reliable wireless flash triggering. Say goodbye to transmitters and receivers to trigger flashes, studio lights and cameras - one remote will do it all. The Atlas II triggers flashes at sync speeds of up to 1/250 sec. The system will trigger cameras, flashes and studio lights at distances of 350 meters or more. The Phottix Atlas II is a transceiver. With the simple change of a switch the Atlas II is ready to either transmit or receive signals. Simplify your off-camera flash triggering - one unit can be used as a transmitter or receiver. The Atlas II is compatible with Phottix Strato and Odin series TTL triggers. It fits in perfectly with Phottix's existing line-up, allowing the power and freedom of a long-range transceiver. Triggering flashes is only one of the Phottix Atlas II functions. It can also be used, with Phottix Accessory Cables, as a wired or wireless shutter release. It now features a two stage shutter button - a half-press will autofocus, a full press takes a photo.