The PFT-28s is an on-camera 2.4 GHz radio transmitter designed to work with the recently announced Polaris PFT-28 receiver to trigger mounted speedlights or connected studio lights.  The PFT-28s completes the Polaris communication circle  anchored by the Karat Flash Meter with attached PFT-28 Transmitter.  Now your flashes may be triggered from the meter position or the camera position!