Description Dedicated to selectCanoncameras featuring a Multi-Function Shoe, theST-E10 Speedlite Transmitteris a compact, lightweight transmitter capable of triggering up to five groups or 15 individual Speedlites within a 98.4′ range. This dedicated transmitter utilizes the Multi-Function Shoe to provide power and a digital connection, meaning no batteries or cabled connections are required for use and there is a more reliable connection compared to line-of-sight transmissions.