10,000 Non Stop Flashes all day, every day. Smaller, lighter and more powerful at 80 watt seconds than other shoe mount flashes, the new Qflash TRIO delivers the light quality and ruggedness others can 39;t match. TRIO is dedicated to Canon and Nikon TTL systems. Auto focus assist, High Speed Sync , more power , shoe mounted TRIO produces studio quality light from a parabolic reflector. TRIO ruggedness lets you shoot full power every second, for as long as you need. Qflash flashtubes have been tested to 250,000 continuous full power flashes in a 1400 hour test and they are user replaceable. TRIO has wireless TTL control with a built in FreeXwire transceiver, send dedicated iTTL Nikon or ETTL II Canon information 600 Feet to remote digital Qflashes. No external radios required. FreeXwire radio is not prone to line of sight interruption. TRIO coordinates the Qflash system for your studio and location lighting, wirelessly change settings of remote Qflashes. Shoot TTL, Auto, Auto fill, or Manual. Runs on Turbo rechargeable power no need for AC mains.