Flash Royalty. The Westcott FJ-X3 S Wireless Flash Trigger for Sony Cameras is designed with ease in mind. This flash is certifiably decked out with a large display, user-friendly menu, and multi-select control pad for making quick adjustments. Customizable functions include TTL, High Speed Sync, Freeze, Front, and Rear Curtain Sync, group and channel assignment, group exposure compensation, TTL to equivalent manual, modeling lamp settings, and much more. Westcott’s mobile app allows you to remotely adjust FJ Wireless flash settings via built-in Bluetooth. Using the app increases the number of groups with color-coding options for quick recognition. It also allows you to save lighting scenario settings and includes other time-saving features.