Sekonic RT-GX Godox Module for L-858DSekonic RT GX Godox Module for L 858D The Sekonic SE RT GX Transmitter is a user replaceable radio module that fits neatly next to the batteries in the Speedmaster L 858D Light Meter. This transmitter offers wireless radio flash triggering of Godox compatible flashes. Key Features: Wireless radio flash triggering of Godox compatible flashes 32 channels (1 32), 16 groups (A F,0 9) and Wireless ID's Measure HSS and percentage of flash in your images