Sekonic Transmitter Module RT-BR for L-858D Speedmaster light meter. Used to trigger broncolor enabled lighting and receivers. Triggering and controlling the power level of broncolor RFS2/2.1/2.2 (2.4GHz) system built-in flash units Modeling lamp ON/OFF Radio Studio Address: 99 (1 to 99) Lamp Address: 40 (1 to 40) + ALL For more information about broncolor, see the website: https://www.broncolor.swiss Note: This model may not be available due to the restriction of regulation in each country. Please be sure to check the radio frequency before purchase. For more detail about radio triggering, please see here. Catalog Numbers: SKU: 401-629 Measuring Range and Modes: Radio System: broncolor RFS 2/2.1/2.2 system (2.4GHz) Physical: Operating Temperature: -10 deg. C to 50 deg. C Product Weight (lb): 0.02 Product Weight (kg): 0.01 Product Height (in): 1.1 Product Length (in): 1.3 Product Width (in): 0.47 Product Height (cm): 2.8 Product Length (cm): 3.3 Product Width (cm): 1.2 Startup Guide Safety Precaution CE Countries List Downloadable from website: Operating Manual Startup Guide Sekonic RT-BR broncolor Transmitter Module for the L-858D-U Light Meters Firmware