Canon Speedlite 600EX-RT Flash Type_Signal Processing which gives you four times

which gives you four times more detail than a 24" class Full HD resolution monitor

The PerfectCue Signaling System – Mini from DSan is a USB-powered cue light that provides a compact signaling solution allowing the speaker to send cues to the projectionist via a hand-held wireless actuator device

This system also does not need direct line-of-site like traditional optical-based transmission and will work through obstacles

the SkyPanel S60 has more than enough light for most applications

Canon Speedlite 600EX-RT Flash Type_Signal Processing which gives you four timesComplete with built in radio transmission wireless functionality, the Speedlite 600EX RT sits at the top of Canon's on camera E TTL E TTL II compatible flash lineup with a powerful guide number of 197' at ISO 100 and 200mm. This two way 2. 4 GHz radio system provides added reliability and a range up to 98. 4' among up to 5 groups with a total of 15 individual Speedlites. This system also does not need direct line of site like traditional optical based