TR series: High performance high compatibility high-power flash output Wireless trigger sensors: Remote sensing CELL 2 mode for off-camera TTL flash sync Increase the external power outlet: TR series adds an external power outlet call back the higher rate to meet your needs Quick call back: Full output only 2.9s recycle time do not apply the new battery can also call back to obtain a rapid rate only 4~5s Support high-speed continuous shooting: 1/16 and below the brightness TR series to support high-speed continuous shooting 12EPS Power-Saving mode: When the flash without any action on the backlight turned off after 20s CPU automatically goes to sleep when non-work within 60s and automatically shut down when non-work over 30 minutes. High precision output: 1/128~1/18 stalls to lose each stall has two fine-tuning compensation. Overheat protection; Built-in temperature detection (thermal protection) Supports second-curtain sync: Uses a slow shutter for making smear subject the flash will be off the moment the shutter flash spill this is the rear-curtain sync function.