--- product_id: 331532454 title: "Transmitter Module RT-GX for L-858D-U Speedmaster Light Meter, Godox & Flashpoint Wireless Flash Control Expansion Module, Internal User-Replaceable Radio System" brand: "sekonic" price: "1355 zł" currency: PLN in_stock: true reviews_count: 4 url: https://www.desertcart.pl/products/331532454-transmitter-module-rt-gx-for-l-858d-u-speedmaster-light store_origin: PL region: Poland --- # Instant strobe adjustment Wireless control range Seamless device integration Transmitter Module RT-GX for L-858D-U Speedmaster Light Meter, Godox & Flashpoint Wireless Flash Control Expansion Module, Internal User-Replaceable Radio System **Brand:** sekonic **Price:** 1355 zł **Availability:** ✅ In Stock ## Summary > 📡 Light control in your hands—master every shot with wireless precision! ## Quick Answers - **What is this?** Transmitter Module RT-GX for L-858D-U Speedmaster Light Meter, Godox & Flashpoint Wireless Flash Control Expansion Module, Internal User-Replaceable Radio System by sekonic - **How much does it cost?** 1355 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/331532454-transmitter-module-rt-gx-for-l-858d-u-speedmaster-light) ## Best For - sekonic enthusiasts ## Why This Product - Trusted sekonic brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built for the Grind:** Rugged, professional-grade construction designed to endure the toughest shoots and environments. - • **Streamlined Workflow:** Integrate your lighting gear seamlessly—experience a smoother, faster creative process that keeps you ahead. - • **Tailored Compatibility:** Engineered exclusively for the L-858D-U SPEEDMASTER to guarantee flawless communication and zero lag. - • **Effortless Wireless Control:** Adjust Flashpoint & Godox strobes remotely from your Sekonic meter—cut setup time, boost on-set efficiency. - • **Precision Lighting Every Time:** Maintain Sekonic’s signature accuracy for perfectly exposed shots, no retakes needed. ## Overview The Sekonic RT-GX Transmitter Module transforms your L-858D-U SPEEDMASTER light meter into a wireless command center for Flashpoint and Godox strobes, delivering precise exposure readings and remote strobe control in a durable, professional-grade design. ## Description SekonicTransmitter Module RT-GX for L-858D-U Speedmaster Light Meter ## Features - SEAMLESS INTEGRATION - The RT-GX module effortlessly connects your Sekonic L-858D-U SPEEDMASTER light meter with Flashpoint and Godox lighting systems, streamlining your workflow. - ENHANCED COMPATIBILITY - Specifically designed for the Sekonic L-858D-U SPEEDMASTER, this module ensures flawless communication with your existing equipment for reliable performance. - WIRELESS CONTROL - Remotely adjust your Flashpoint and Godox strobes directly from your light meter, saving time and increasing efficiency on set with ultimate convenience. - ACCURATE MEASUREMENTS - Maintain the precision you expect from Sekonic, ensuring every shot is perfectly lit with consistent and dependable exposure readings every time. - DURABLE DESIGN - Built to withstand the rigors of professional use, its robust construction guarantees long-lasting performance and reliability in demanding environments. ## Images ![Transmitter Module RT-GX for L-858D-U Speedmaster Light Meter, Godox & Flashpoint Wireless Flash Control Expansion Module, Internal User-Replaceable Radio System - Image 1](https://m.media-amazon.com/images/I/81MrGMuN+BL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great price! *by A***O on March 10, 2024* This is exactly what I needed. Works perfectly and a fair price… I saved some money from buying brand new! Thanks! ### ⭐⭐⭐⭐⭐ Great module and works seamlessly. *by R***Z on May 13, 2022* Works great. Update Sekonic to its latest firmware before using this otherwise it won't recognize the module. That's what happened to me. ### ⭐⭐ Transmitter for Sekonic L-858D-U (MODEL:RT-GX) *by B***R on March 22, 2025* Hello, I recently purchased this product for my Sekonic L-858D-U, and when I installed it on my light meter, it didn't work. When I held the transmitter in my hand, I shook it and it made a rattling noise inside. Could the transmitter be faulty? Can anyone give me their opinion on whether they hold the transmitter in their hands and when they shake it, it makes a rattle-like sound? Is this normal? Thank you for your comment. ## Frequently Bought Together - Sekonic Transmitter Module RT-GX for L-858D-U Speedmaster Light Meter - Sekonic Speedmaster L-858D-U Light Meter (401-858) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pl/products/331532454-transmitter-module-rt-gx-for-l-858d-u-speedmaster-light](https://www.desertcart.pl/products/331532454-transmitter-module-rt-gx-for-l-858d-u-speedmaster-light) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-04-26*