TR series: High performance, high compatibility, high-power flash output. Increase the external power outlet: TR series adds an external power outlet call back the higher rate to meet your needs. Support high-speed continuous shooting: 1/16 and below the brightness, TR series to support high-speed continuous shooting 12SEPS. High-precision output: From 1/128 to 1/1, 8 stalls to lose, each stall have two fine-tuning compensation. Overheat protection: Built-temperature detection (thermal protection).