The Profoto Air Sync is an eight channel radio slave transceiver designed to work with the Pro 8a series, which have the Air radio slave built-in. It will also function with other power packs or monolights that have no built-in radio slaves. This transceiver can control the firing (but not power levels) of an unlimited number of power packs and monolights on eight channels (if each is supplied with one of these transceivers). It can mount to your camera's hot shoe, or sync to your flash terminal for firing.
Operating from two AAA batteries, at a frequency of 2.4GHz, the Air Sync has a range of 1000' (300 m). It can sync up to 1/250 second with a focal plane shutter camera and 1/500 second with a leaf shutter camera. Its triggering speed is over 100 fps.